It was concluded that the described HPLC method could be used for the assayof salmon calcitonin in injection, as it offers qualified selectivity, accuracy and precision ofanalysis.
智能电网的安全运行高度依赖信息环节功能所提供的强大技术保障,致使电网在运行过程中易受到恶性数据注入等网络攻击的威胁,其中空间隐蔽型恶性数据注入攻击是最普遍的一种。为保证该类恶性数据注入攻击在电网运行中能被高效实时检测处...智能电网的安全运行高度依赖信息环节功能所提供的强大技术保障,致使电网在运行过程中易受到恶性数据注入等网络攻击的威胁,其中空间隐蔽型恶性数据注入攻击是最普遍的一种。为保证该类恶性数据注入攻击在电网运行中能被高效实时检测处理,提出一套面向监视控制与数据采集(supervisory control and data acquisition,SCADA)和相量测量单元(phasor measurement unit,PMU)混合量测的智能电网恶性数据在线防御流程。首先通过历史状态量获取与状态预测实现状态量挖掘,再进行SCADA仪表与PMU量测量的恶性数据检测、剔除与修正。此外,该文提出一种适用于混合量测系统的多重匹配状态预测方法,其预测结果作为状态参考用以打破恶性数据隐蔽性。IEEE-14和IEEE-118节点测试系统仿真结果验证了所提方法预测准确性及在线检测空间隐蔽型恶性数据的有效性。展开更多
In this paper, two schemes for teleporting an unknown two-particle entangled state from the sender （Alice） to the receiver （Bob） via a four-particle entangled cluster state are proposed. In these two schemes, the ...In this paper, two schemes for teleporting an unknown two-particle entangled state from the sender （Alice） to the receiver （Bob） via a four-particle entangled cluster state are proposed. In these two schemes, the unknown twoparticle entangled state can be teleported perfectly. The successful probabilities and fidelities of the schemes can reach unity.展开更多
AIM To investigate the possible long-term psychological harm of participating in colorectal cancer(CRC)screening in Norway.METHODS In a prospective, randomized trial, 14294 participants(aged 50-74 years) were invited ...AIM To investigate the possible long-term psychological harm of participating in colorectal cancer(CRC)screening in Norway.METHODS In a prospective, randomized trial, 14294 participants(aged 50-74 years) were invited to either flexible sigmoidoscopy(FS) screening, or a faecal immunochemical test(FIT)(1:1). In total, 4422 screening participants(32%) completed the questionnaire, which consisted of the Hospital Anxiety and Depression Scale and the SF-12, a generic health-related quality of life(HRQOL) measurement, when invited to screening and one year after the invitation. A control group of 7650 individuals was invited to complete the questionnaire only, at baseline and one year after, and 1911(25%) completed the questionnaires.RESULTS Receiving a positive or negative screening result and participating in the two different screening modalities did not cause clinically relevant mean changes in anxiety, depression or HRQOL after one year. FS screening, but not FIT, was associated with an increased probability of being an anxiety case(score ≥ 8) at the one-year follow-up(5.6% of FS participants transitioned from being not anxious to anxious, while 3.0% experienced the reverse). This increase was moderately significantly different from the changes in the control group(in which the corresponding numbers were 4.8% and 4.5%, respectively), P = 0.06. CONCLUSION Most individuals do not experience psychological effects of CRC screening participation after one year, while FS participation is associated with increased anxiety for a smaller group.展开更多
Using cluster state and single qubit measurement one can perform the one-way quantum computation. Here we give a detailed scheme for realizing a modified Grover search algorithm using measurements on cluster state. We...Using cluster state and single qubit measurement one can perform the one-way quantum computation. Here we give a detailed scheme for realizing a modified Grover search algorithm using measurements on cluster state. We give the measurement pattern for the cluster-state realization of the algorithm and estimated the number of measurement needed for its implementation. It is found that O（2^3n/^2n^2） number of single qubit measurements is required for its realization in a cluster-state quantum computer.展开更多
Multiphase induction machine is normally controlled using rotor field oriented vector control. Under phase（s） loss, the machine currents can be optimally controlled to satisfy certain optimization criteria. In this ...Multiphase induction machine is normally controlled using rotor field oriented vector control. Under phase（s） loss, the machine currents can be optimally controlled to satisfy certain optimization criteria. In this paper, a vector control scheme to a five-phase induction machine is introduced to ensure equal phase currents and minimum torque ripples under a phase open circuit. The controller idea can be extended to any number of phases with any number of open phases. The fundamental dq components of the stator voltage are obtained using only two PI controllers for the fundamental sequence plane, as in conventional vector control of three-phase machines. Based on steady state model, a simple expression is derived to estimate the required dq voltage components of other sequence planes to ensure equal stator phase currents and minimum torque ripple. A five-phase machine is simulated using MATLAB/Simulink to ensure controller validity.展开更多
A very simpJe theoretical scheme is proposed to implement two-and three-qubit controlled-phase gates firstly only using a single resonant interaction between ladder-type three-level atoms and the single-mode cavity. I...A very simpJe theoretical scheme is proposed to implement two-and three-qubit controlled-phase gates firstly only using a single resonant interaction between ladder-type three-level atoms and the single-mode cavity. In the presented protocol, the quantum information is encoded on the stable ground states of the atoms （as the controlling qubits） and the zero- and one-photon Fock states of cavity-field （as the target qubit）. Under the influence of the atomic spontaneous emission, the decay of the cavity-mode, and deviation of the coupling strength, the three-qubit controlled- phase gate may have a comparatively high fidelity. The experimental feasibility of controlled-phase gate and the ease that is extended to realize N-qubit controlled-phase gate are also discussed.展开更多
The radiation dose received by patients undergoing chest radiography was included. 200 patients who attended these investigations in 10 hospitals in Iran were randomly selected from all ages groups and both female and...The radiation dose received by patients undergoing chest radiography was included. 200 patients who attended these investigations in 10 hospitals in Iran were randomly selected from all ages groups and both female and male. Critically ill patients were excluded. This paper presents the work, which was implemented on 200 patients and evaluated using the entrance skin dose （ESD） in the posterior anterior （PA） chest projection measured directly at the center of the X-ray field. In addition, the machine room, and dark room .parameters, as well as work practices and repeat rates were studied. The quality control （QC） parameters and the ESD before and after QC were evaluated utilizing an anthropomorphic phantom to define the optimal exposure condition at all hospitals. This research shows that after using the QC parameters and after optimization of the exposure conditions, the ESD was decreased by 42% on average. Also the qua/ity of the radiographs generally increased. The reported method is easily implemented in any clinical situation where optimization of chest radiography is needed.展开更多
In this paper, gas chromatography-mass spectrometry （GS-MS） was used to build the standard fingerprint of volatile oil from Rosa multiflora Thunb. from 12 different habitats. Fourteen components in the volatile oil ...In this paper, gas chromatography-mass spectrometry （GS-MS） was used to build the standard fingerprint of volatile oil from Rosa multiflora Thunb. from 12 different habitats. Fourteen components in the volatile oil were identified as the indicator components ofR. multiflora, of which one was selected as the standard. The GC analysis conditions used for fingerprinting afford a very good separating effect. The similarity of the 12 volatile oils from R. multiflora Thunb. was more than 0.84, and the precision, stability and repeatability of the fingerprints were quite good. It could be concluded that the fingerprints can be used as the standard and as a quality control method for medicinal materials from R. multiflora Thunb..展开更多
Sinopodophylli Fructus is the commonly used traditional Tibetan medicinal herb. In the present study, we established a reversed-phase high performance liquid chromatography method to simultaneously determine three lig...Sinopodophylli Fructus is the commonly used traditional Tibetan medicinal herb. In the present study, we established a reversed-phase high performance liquid chromatography method to simultaneously determine three lignans and five flavonoid constituents, namely podophyllotoxin, desoxypodophyUotoxin, 4＇-demethyldesoxypodophyllotoxin, 8-prenylkaemferol, quercetin, kaempferol, 8,2＇-diprenylquercetin 3-methylether and 8-prenylquercetin, in Sinopodophylli Fructus. The chromatographic separation was achieved on a C_18 analytical column with a gradient mobile phase consisting of acetonitrile and 0.05% phosphoric acid at a flow rate of 1.0 mL/min. UV detection was set at 290 nm and 370 rim, and the column oven was set at 35℃. This method provided a good reproducibility, and its overall intra- and inter-day precision was less than 3% and 4%, respectively. The recovery of the method was 98.29%-101.60%, and a good linearity （R2≥0.9992） was obtained for all the analytes over a relatively wide range of concentration. A total of 17 samples ofS. hexandrum （12 fruits, 5 roots and rhizomes） were collected from different areas and then successfully quantified. The results indicated that the contents of eight compounds significantly varied （the sum content ranged from 16.90 to 55.68 mg/g）, and prenylated fiavonoids could be used as marker constituents in the identification and quality control of Sinopodophylli Fructus.展开更多
A reversed-phase high-performance liquid chromatography （RP-HPLC） method was established for the simultaneous determination of three major constituents,/-calycanthine, quercetin, and kaempferol, in Chimonanthi Niten...A reversed-phase high-performance liquid chromatography （RP-HPLC） method was established for the simultaneous determination of three major constituents,/-calycanthine, quercetin, and kaempferol, in Chimonanthi Nitentis Folium. The RP-HPLC analysis was carried out using an Agilent HC-C18 （4.6 mm×250 mm, 5 μm） column and a gradient mobile phase consisting of methanol and phosphate buffer （10：90→90：10, v/v） at a flow rate of 1.0 mL/min. The column temperature was 25 ℃ and the detection wavelength was set at 239 nm from 0 to 15 min and 365 nm from 16 to 45 min. All calibration curves showed good linearity （R2〉0.9991） within test ranges. Relative standard deviations of repeated analyses were less than 2.64% （n = 6）, and the recovery of this method was 97.47%-98.26%. The contents of these three analytes were determined for the samples from different harvest times. The results showed that the/-calycanthine content in herbs increases from 99.94 μg/g to 468.0μg/g from April to July, whereas the content of quercetin and kaempferol was higher in April and May than that in June and July, which were consistent with the Chinese traditional medicine＇s use of Chimonanthi Nitentis Folium in Spring. Herein, a simple, rapid and accurate analytical method is presented and successfully applied for the simultaneous quantitative analysis of alkaloids and flavones from Chimonanthus nitens Oliv.展开更多
We propose an effective method to realize the quantum phase gate the system in which the transmon qubits are capacitively coupled to of one qubit simultaneously controlling N qubits. We use a superconducting transmiss...We propose an effective method to realize the quantum phase gate the system in which the transmon qubits are capacitively coupled to of one qubit simultaneously controlling N qubits. We use a superconducting transmission line resonator driven by a strong microwave field. In our scheme, the phase gate can be realized in a time （nanosecond-scale） much shorter than deco herence time （microsecond-scale）, and it is more immune to the l/（charge noise and has longer dephasing time due to the fa vorable properties of the transmon qubits in the system.展开更多
The dynamic evolution of a multi-level atom in the three-dimensional photonic crystal under an applied magnetic field is investigated.By combining the Zeeman effect with the photonic band gap effect,the dynamic quantu...The dynamic evolution of a multi-level atom in the three-dimensional photonic crystal under an applied magnetic field is investigated.By combining the Zeeman effect with the photonic band gap effect,the dynamic quantum superposition states and steady quantum coherent trapping states of the atom can be flexibly controlled.This paves the way for coherent manipulation of quantum states in the solid-state system,which has important applications in quantum information processing.展开更多
Bosonic modes have wide applications in various quantum technologies,such as optical photons for quantum communication,magnons in spin ensembles for quantum information storage and mechanical modes for reversible micr...Bosonic modes have wide applications in various quantum technologies,such as optical photons for quantum communication,magnons in spin ensembles for quantum information storage and mechanical modes for reversible microwave-to-optical quantum transduction.There is emerging interest in utilizing bosonic modes for quantum information processing,with circuit quantum electrodynamics(circuit QED)as one of the leading architectures.Quantum information can be encoded into subspaces of a bosonic superconducting cavity mode with long coherence time.However,standard Gaussian operations(e.g.,beam splitting and two-mode squeezing)are insufficient for universal quantum computing.The major challenge is to introduce additional nonlinear control beyond Gaussian operations without adding significant bosonic loss or decoherence.Here we review recent advances in universal control of a single bosonic code with superconducting circuits,including unitary control,quantum feedback control,drivendissipative control and holonomic dissipative control.Various approaches to entangling different bosonic modes are also discussed.展开更多
We propose a scheme for realizing an unconventional three-qubit controlled-phase gate via the Rydberg blockade mechanism.The qubit is encoded by atomic ensembles that are trapped in optical traps and fixed on an atom ...We propose a scheme for realizing an unconventional three-qubit controlled-phase gate via the Rydberg blockade mechanism.The qubit is encoded by atomic ensembles that are trapped in optical traps and fixed on an atom chip.Because of the collective nature of the encoding and the Rydberg blockade mechanism,the scheme do not require separate addressing of individual atoms.The time needed for the gate operation is much shorter than that in a similar scheme.In addition,we show the gate can be used as a basic tool for effective generation of large-scale 2D cluster states.展开更多
文摘It was concluded that the described HPLC method could be used for the assayof salmon calcitonin in injection, as it offers qualified selectivity, accuracy and precision ofanalysis.
文摘智能电网的安全运行高度依赖信息环节功能所提供的强大技术保障,致使电网在运行过程中易受到恶性数据注入等网络攻击的威胁,其中空间隐蔽型恶性数据注入攻击是最普遍的一种。为保证该类恶性数据注入攻击在电网运行中能被高效实时检测处理,提出一套面向监视控制与数据采集(supervisory control and data acquisition,SCADA)和相量测量单元(phasor measurement unit,PMU)混合量测的智能电网恶性数据在线防御流程。首先通过历史状态量获取与状态预测实现状态量挖掘,再进行SCADA仪表与PMU量测量的恶性数据检测、剔除与修正。此外,该文提出一种适用于混合量测系统的多重匹配状态预测方法,其预测结果作为状态参考用以打破恶性数据隐蔽性。IEEE-14和IEEE-118节点测试系统仿真结果验证了所提方法预测准确性及在线检测空间隐蔽型恶性数据的有效性。
基金The project supported by the National Natural Science Foundation of China under Grant No. 60678022, the Key Program of the Education Department of Anhui Province under Grant Nos. 2006KJ070A, 2006KJ057B and the Talent Foundation of Anhui University
文摘In this paper, two schemes for teleporting an unknown two-particle entangled state from the sender （Alice） to the receiver （Bob） via a four-particle entangled cluster state are proposed. In these two schemes, the unknown twoparticle entangled state can be teleported perfectly. The successful probabilities and fidelities of the schemes can reach unity.
基金Supported by the Ministry of Health and Care Services in Norway
文摘AIM To investigate the possible long-term psychological harm of participating in colorectal cancer(CRC)screening in Norway.METHODS In a prospective, randomized trial, 14294 participants(aged 50-74 years) were invited to either flexible sigmoidoscopy(FS) screening, or a faecal immunochemical test(FIT)(1:1). In total, 4422 screening participants(32%) completed the questionnaire, which consisted of the Hospital Anxiety and Depression Scale and the SF-12, a generic health-related quality of life(HRQOL) measurement, when invited to screening and one year after the invitation. A control group of 7650 individuals was invited to complete the questionnaire only, at baseline and one year after, and 1911(25%) completed the questionnaires.RESULTS Receiving a positive or negative screening result and participating in the two different screening modalities did not cause clinically relevant mean changes in anxiety, depression or HRQOL after one year. FS screening, but not FIT, was associated with an increased probability of being an anxiety case(score ≥ 8) at the one-year follow-up(5.6% of FS participants transitioned from being not anxious to anxious, while 3.0% experienced the reverse). This increase was moderately significantly different from the changes in the control group(in which the corresponding numbers were 4.8% and 4.5%, respectively), P = 0.06. CONCLUSION Most individuals do not experience psychological effects of CRC screening participation after one year, while FS participation is associated with increased anxiety for a smaller group.
基金the National Fundamental Research Program under Grant No.2006CBOL0106National Natural Science Foundation of China under Grant Nos.10325521 and 60433050+1 种基金the Key Grant Project of the Ministry of Education under Grant No.306020the SRFDP Program of the Ministry of Education
文摘Using cluster state and single qubit measurement one can perform the one-way quantum computation. Here we give a detailed scheme for realizing a modified Grover search algorithm using measurements on cluster state. We give the measurement pattern for the cluster-state realization of the algorithm and estimated the number of measurement needed for its implementation. It is found that O（2^3n/^2n^2） number of single qubit measurements is required for its realization in a cluster-state quantum computer.
文摘Multiphase induction machine is normally controlled using rotor field oriented vector control. Under phase（s） loss, the machine currents can be optimally controlled to satisfy certain optimization criteria. In this paper, a vector control scheme to a five-phase induction machine is introduced to ensure equal phase currents and minimum torque ripples under a phase open circuit. The controller idea can be extended to any number of phases with any number of open phases. The fundamental dq components of the stator voltage are obtained using only two PI controllers for the fundamental sequence plane, as in conventional vector control of three-phase machines. Based on steady state model, a simple expression is derived to estimate the required dq voltage components of other sequence planes to ensure equal stator phase currents and minimum torque ripple. A five-phase machine is simulated using MATLAB/Simulink to ensure controller validity.
基金Supported by Key Scientific Research Fund of Hunan Provincial Education Department of China under Grant No. 09A013Natural Science Foundation of Hunan Province of China under Grant No. 08J J3001Normal and Science Foundation of Hengyang Normal University of China under Grant No. 09A28
文摘A very simpJe theoretical scheme is proposed to implement two-and three-qubit controlled-phase gates firstly only using a single resonant interaction between ladder-type three-level atoms and the single-mode cavity. In the presented protocol, the quantum information is encoded on the stable ground states of the atoms （as the controlling qubits） and the zero- and one-photon Fock states of cavity-field （as the target qubit）. Under the influence of the atomic spontaneous emission, the decay of the cavity-mode, and deviation of the coupling strength, the three-qubit controlled- phase gate may have a comparatively high fidelity. The experimental feasibility of controlled-phase gate and the ease that is extended to realize N-qubit controlled-phase gate are also discussed.
文摘The radiation dose received by patients undergoing chest radiography was included. 200 patients who attended these investigations in 10 hospitals in Iran were randomly selected from all ages groups and both female and male. Critically ill patients were excluded. This paper presents the work, which was implemented on 200 patients and evaluated using the entrance skin dose （ESD） in the posterior anterior （PA） chest projection measured directly at the center of the X-ray field. In addition, the machine room, and dark room .parameters, as well as work practices and repeat rates were studied. The quality control （QC） parameters and the ESD before and after QC were evaluated utilizing an anthropomorphic phantom to define the optimal exposure condition at all hospitals. This research shows that after using the QC parameters and after optimization of the exposure conditions, the ESD was decreased by 42% on average. Also the qua/ity of the radiographs generally increased. The reported method is easily implemented in any clinical situation where optimization of chest radiography is needed.
文摘In this paper, gas chromatography-mass spectrometry （GS-MS） was used to build the standard fingerprint of volatile oil from Rosa multiflora Thunb. from 12 different habitats. Fourteen components in the volatile oil were identified as the indicator components ofR. multiflora, of which one was selected as the standard. The GC analysis conditions used for fingerprinting afford a very good separating effect. The similarity of the 12 volatile oils from R. multiflora Thunb. was more than 0.84, and the precision, stability and repeatability of the fingerprints were quite good. It could be concluded that the fingerprints can be used as the standard and as a quality control method for medicinal materials from R. multiflora Thunb..
基金National Key Technology R&D Program"New Drug Innovation"of China(Grant No.2009ZX09308-004,2013ZX09103002-006)
文摘Sinopodophylli Fructus is the commonly used traditional Tibetan medicinal herb. In the present study, we established a reversed-phase high performance liquid chromatography method to simultaneously determine three lignans and five flavonoid constituents, namely podophyllotoxin, desoxypodophyUotoxin, 4＇-demethyldesoxypodophyllotoxin, 8-prenylkaemferol, quercetin, kaempferol, 8,2＇-diprenylquercetin 3-methylether and 8-prenylquercetin, in Sinopodophylli Fructus. The chromatographic separation was achieved on a C_18 analytical column with a gradient mobile phase consisting of acetonitrile and 0.05% phosphoric acid at a flow rate of 1.0 mL/min. UV detection was set at 290 nm and 370 rim, and the column oven was set at 35℃. This method provided a good reproducibility, and its overall intra- and inter-day precision was less than 3% and 4%, respectively. The recovery of the method was 98.29%-101.60%, and a good linearity （R2≥0.9992） was obtained for all the analytes over a relatively wide range of concentration. A total of 17 samples ofS. hexandrum （12 fruits, 5 roots and rhizomes） were collected from different areas and then successfully quantified. The results indicated that the contents of eight compounds significantly varied （the sum content ranged from 16.90 to 55.68 mg/g）, and prenylated fiavonoids could be used as marker constituents in the identification and quality control of Sinopodophylli Fructus.
基金National Natural Science Foundation of China(Grant No.81360631)
文摘A reversed-phase high-performance liquid chromatography （RP-HPLC） method was established for the simultaneous determination of three major constituents,/-calycanthine, quercetin, and kaempferol, in Chimonanthi Nitentis Folium. The RP-HPLC analysis was carried out using an Agilent HC-C18 （4.6 mm×250 mm, 5 μm） column and a gradient mobile phase consisting of methanol and phosphate buffer （10：90→90：10, v/v） at a flow rate of 1.0 mL/min. The column temperature was 25 ℃ and the detection wavelength was set at 239 nm from 0 to 15 min and 365 nm from 16 to 45 min. All calibration curves showed good linearity （R2〉0.9991） within test ranges. Relative standard deviations of repeated analyses were less than 2.64% （n = 6）, and the recovery of this method was 97.47%-98.26%. The contents of these three analytes were determined for the samples from different harvest times. The results showed that the/-calycanthine content in herbs increases from 99.94 μg/g to 468.0μg/g from April to July, whereas the content of quercetin and kaempferol was higher in April and May than that in June and July, which were consistent with the Chinese traditional medicine＇s use of Chimonanthi Nitentis Folium in Spring. Herein, a simple, rapid and accurate analytical method is presented and successfully applied for the simultaneous quantitative analysis of alkaloids and flavones from Chimonanthus nitens Oliv.
基金supported by the National Natural Science Foundation of China (Grant No. 10947017/A05)the Key Lab of Novel Thin Film Solar Cells (Grant No. KF200912)Graduates’ Innovative Scientific Research Project of Zhejiang Province (Grant No. 2011831)
文摘We propose an effective method to realize the quantum phase gate the system in which the transmon qubits are capacitively coupled to of one qubit simultaneously controlling N qubits. We use a superconducting transmission line resonator driven by a strong microwave field. In our scheme, the phase gate can be realized in a time （nanosecond-scale） much shorter than deco herence time （microsecond-scale）, and it is more immune to the l/（charge noise and has longer dephasing time due to the fa vorable properties of the transmon qubits in the system.
基金supported by the National Key Basic Research Special Foundation of China (Grant Nos. 2006CB921706 and 2010CB923200)the National Natural Science Foundation of China (Grant Nos. 10574160 and10725420)
文摘The dynamic evolution of a multi-level atom in the three-dimensional photonic crystal under an applied magnetic field is investigated.By combining the Zeeman effect with the photonic band gap effect,the dynamic quantum superposition states and steady quantum coherent trapping states of the atom can be flexibly controlled.This paves the way for coherent manipulation of quantum states in the solid-state system,which has important applications in quantum information processing.
基金support from the ARO (W911NF-18-1-0020 and W911NF-18-1-0212)ARO MURI (W911NF-16-1-0349)+3 种基金AFOSR MURI (FA9550-19-1-0399)NSF (EFMA-1640959, OMA-1936118, EEC-1941583)NTT Research, the Packard Foundation (201339273)the Startup Foundation of Institute of Semiconductors, Chinese Academy of Sciences (E0SEBB11)。
文摘Bosonic modes have wide applications in various quantum technologies,such as optical photons for quantum communication,magnons in spin ensembles for quantum information storage and mechanical modes for reversible microwave-to-optical quantum transduction.There is emerging interest in utilizing bosonic modes for quantum information processing,with circuit quantum electrodynamics(circuit QED)as one of the leading architectures.Quantum information can be encoded into subspaces of a bosonic superconducting cavity mode with long coherence time.However,standard Gaussian operations(e.g.,beam splitting and two-mode squeezing)are insufficient for universal quantum computing.The major challenge is to introduce additional nonlinear control beyond Gaussian operations without adding significant bosonic loss or decoherence.Here we review recent advances in universal control of a single bosonic code with superconducting circuits,including unitary control,quantum feedback control,drivendissipative control and holonomic dissipative control.Various approaches to entangling different bosonic modes are also discussed.
基金supported by the National Natural Science Foundation of China (Grant Nos.61275215 and 11004033)the Natural Science Foundation of Fujian Province (Grant No.2010J01002)the National Fundamental Research Program of China (Grant No.2011CBA00203)
文摘We propose a scheme for realizing an unconventional three-qubit controlled-phase gate via the Rydberg blockade mechanism.The qubit is encoded by atomic ensembles that are trapped in optical traps and fixed on an atom chip.Because of the collective nature of the encoding and the Rydberg blockade mechanism,the scheme do not require separate addressing of individual atoms.The time needed for the gate operation is much shorter than that in a similar scheme.In addition,we show the gate can be used as a basic tool for effective generation of large-scale 2D cluster states.
