Recently,a Rydberg atom-based mixer was developed to measure the phase of a radio frequency(RF)field.The phase of the signal RF(SIG RF)field is down-converted directly to the phase of a beat signal created by the pres...Recently,a Rydberg atom-based mixer was developed to measure the phase of a radio frequency(RF)field.The phase of the signal RF(SIG RF)field is down-converted directly to the phase of a beat signal created by the presence of a local RF(LO RF)field.In this study,we propose that the Rydberg atom-based mixer can be converted to an all-optical phase detector by amplitude modulation(AM)of the LO RF field;that is,the phase of the SIG RF field is related to both the amplitude and phase of the beat signal.When the AM frequency of the LO RF field is the same as the frequency of the beat signal,the beat signal will further interfere with the AM of the LO RF field inside the atom,and then the amplitude of the beat signal is related to the phase of the SIG RF field.The amplitude of the beat signal and the phase of the SIG RF field show a linear relationship within the range of 0 toπ/2 when the phase of the AM is set with a differenceπ/4 from the phase of the LO RF field.The minimum phase resolution can be as small as 0.6°by optimizing the experimental conditions according to a simple theoretical model.This study will expand and contribute to the development of RF measurement devices based on Rydberg atoms.展开更多
A real time system used to detect phase difference between two sinusoidal signals is proposed in this paper. The system is designed to process the phase signal of the far-infrared （FIR） hydrogen cyanide （HCN） inte...A real time system used to detect phase difference between two sinusoidal signals is proposed in this paper. The system is designed to process the phase signal of the far-infrared （FIR） hydrogen cyanide （HCN） interferometer on J-TEXT. It is based on zero-crossing detection and makes use of the digital circuit. Compared with a traditional zero-crossing phase detector, it doesn＇t need to sacrifice the time resolution to expand the phase range. The phase difference is divided into two parts, the integer part and the fraction part. In each detecting cycle, they are detected separately. It outputs digital signals that are more stable for transmission. A prototype was built on J-TEXT using discrete components. A practical method is proposed to deal with the counting error caused by the deviation of electronic components in manufacture. Reasonable results were obtained on the prototype. The phase resolution reaches 2π/64 in test, and can still be improved by raising the clock frequency.展开更多
In this paper, we proposed the scheme for a passive round-robin differential-phase-shift quantum key distribution（RRDPS-QKD） set-up based on the principle of Hong–Ou–Mandel interference. Our scheme requires two le...In this paper, we proposed the scheme for a passive round-robin differential-phase-shift quantum key distribution（RRDPS-QKD） set-up based on the principle of Hong–Ou–Mandel interference. Our scheme requires two legitimate parties to prepare their signal state with two different non-orthogonal bases instead of single in original protocol. Incorporating this characteristic, we establish the level of security of our protocol under the intercept-resend attack and demonstrate its detector-flaw-immune feature. Furthermore, we show that our scheme not only inherits the merit of better tolerance of bit errors and finite-sized-key effects but can be implemented using hardware similar to the measurement device independent QKD（MDI-QKD）. This ensures good compatibility with the current commonly used quantum system.展开更多
The design of phase control system in Shanghai Synchrotron Radiation Facility (SSRF) linac is presented in this paper. And digital phase detecting algorithm, the key for phase control system, is fully described. The t...The design of phase control system in Shanghai Synchrotron Radiation Facility (SSRF) linac is presented in this paper. And digital phase detecting algorithm, the key for phase control system, is fully described. The testing results for phase control system in 100MeV linac are discussed in detail.展开更多
为了有效监测环境水体中的有机氯农药(OCPs)残留,本研究开发了一种低消耗、弱基质效应、经济便捷的固相微萃取技术测定水中13种OCPs残留的方法。应用具有强选择性的硅橡胶(SR)薄膜为固相吸附材料,制备了简便易操作的固相萃取瓶,通过优...为了有效监测环境水体中的有机氯农药(OCPs)残留,本研究开发了一种低消耗、弱基质效应、经济便捷的固相微萃取技术测定水中13种OCPs残留的方法。应用具有强选择性的硅橡胶(SR)薄膜为固相吸附材料,制备了简便易操作的固相萃取瓶,通过优化萃取方式、萃取时间、洗脱溶剂以及洗脱方式等条件,选择涡旋10 min进行SR薄膜对目标物的萃取,利用5 mL V_(正己烷):V_(乙酸乙酯)=1:1溶液洗脱SR薄膜上目标物,采用气相色谱仪进行检测。结果表明:方法检出限在0.001~0.132μg/L之间,定量限为0.2μg/L;决定系数(R^(2))>0.9973;在0.2、1、20μg/L 3个添加水平下,13种农药在水中OCPs的平均回收率在73%~109%之间,相对标准偏差在0.5%~13%之间(n=5)。利用该方法对巢湖、南淝河等合肥市内主要河流进行了13种OCPs残留的检测,结果发现13种OCPs的最高检出质量浓度为3.64μg/L。与已所报道的方法相比,该方法具有灵敏度高、操作简便、成本低等特点,在环境水体OCPs多残留痕量监测领域具有良好的应用前景。展开更多
近年来应用于中高能核物理实验的先进前端读出专用集成电路(application specific integrated circuit,ASIC)芯片呈现出越来越强的数字化趋势,可提高系统的集成度并降低功耗。论文研制了一种高计数率多通道时间测量与串行读出电路(high-...近年来应用于中高能核物理实验的先进前端读出专用集成电路(application specific integrated circuit,ASIC)芯片呈现出越来越强的数字化趋势,可提高系统的集成度并降低功耗。论文研制了一种高计数率多通道时间测量与串行读出电路(high-count rate multi-channel time measurement and serial readout circuit,HMTRC),可实现核事件去稀疏化、去随机化的读出。该电路主要包括了基于时钟分相技术的时间数字转化器、控制器、先进先出存储器和基于令牌环逻辑的轮询读出模块。HMTRC已被集成到一款自研的16通道前端读出ASIC芯片中,可测量和储存时间信息,并利用数字驱动的前端读出架构实现时间与能量信息同步读出。测试表明,时间分辨率好于2 ns,功能符合预期。展开更多
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0304900 and 2017YFA0402300)the Beijing Natural Science Foundation(Grant No.1212014)+3 种基金the National Natural Science Foundation of China(Grant Nos.11604334,11604177,and U2031125)the Key Research Program of the Chinese Academy of Sciences(Grant No.XDPB08-3)the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics(Grant No.KF201807)the Fundamental Research Funds for the Central Universities,and Youth Innovation Promotion Association CAS.
文摘Recently,a Rydberg atom-based mixer was developed to measure the phase of a radio frequency(RF)field.The phase of the signal RF(SIG RF)field is down-converted directly to the phase of a beat signal created by the presence of a local RF(LO RF)field.In this study,we propose that the Rydberg atom-based mixer can be converted to an all-optical phase detector by amplitude modulation(AM)of the LO RF field;that is,the phase of the SIG RF field is related to both the amplitude and phase of the beat signal.When the AM frequency of the LO RF field is the same as the frequency of the beat signal,the beat signal will further interfere with the AM of the LO RF field inside the atom,and then the amplitude of the beat signal is related to the phase of the SIG RF field.The amplitude of the beat signal and the phase of the SIG RF field show a linear relationship within the range of 0 toπ/2 when the phase of the AM is set with a differenceπ/4 from the phase of the LO RF field.The minimum phase resolution can be as small as 0.6°by optimizing the experimental conditions according to a simple theoretical model.This study will expand and contribute to the development of RF measurement devices based on Rydberg atoms.
基金supported by National Natural Science Foundation of China(Nos.11005043 and 11105056)
文摘A real time system used to detect phase difference between two sinusoidal signals is proposed in this paper. The system is designed to process the phase signal of the far-infrared （FIR） hydrogen cyanide （HCN） interferometer on J-TEXT. It is based on zero-crossing detection and makes use of the digital circuit. Compared with a traditional zero-crossing phase detector, it doesn＇t need to sacrifice the time resolution to expand the phase range. The phase difference is divided into two parts, the integer part and the fraction part. In each detecting cycle, they are detected separately. It outputs digital signals that are more stable for transmission. A prototype was built on J-TEXT using discrete components. A practical method is proposed to deal with the counting error caused by the deviation of electronic components in manufacture. Reasonable results were obtained on the prototype. The phase resolution reaches 2π/64 in test, and can still be improved by raising the clock frequency.
基金Project supported by the Fund from the State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications)(Grant No.IPOC2017ZT0)
文摘In this paper, we proposed the scheme for a passive round-robin differential-phase-shift quantum key distribution（RRDPS-QKD） set-up based on the principle of Hong–Ou–Mandel interference. Our scheme requires two legitimate parties to prepare their signal state with two different non-orthogonal bases instead of single in original protocol. Incorporating this characteristic, we establish the level of security of our protocol under the intercept-resend attack and demonstrate its detector-flaw-immune feature. Furthermore, we show that our scheme not only inherits the merit of better tolerance of bit errors and finite-sized-key effects but can be implemented using hardware similar to the measurement device independent QKD（MDI-QKD）. This ensures good compatibility with the current commonly used quantum system.
文摘The design of phase control system in Shanghai Synchrotron Radiation Facility (SSRF) linac is presented in this paper. And digital phase detecting algorithm, the key for phase control system, is fully described. The testing results for phase control system in 100MeV linac are discussed in detail.
文摘为了有效监测环境水体中的有机氯农药(OCPs)残留,本研究开发了一种低消耗、弱基质效应、经济便捷的固相微萃取技术测定水中13种OCPs残留的方法。应用具有强选择性的硅橡胶(SR)薄膜为固相吸附材料,制备了简便易操作的固相萃取瓶,通过优化萃取方式、萃取时间、洗脱溶剂以及洗脱方式等条件,选择涡旋10 min进行SR薄膜对目标物的萃取,利用5 mL V_(正己烷):V_(乙酸乙酯)=1:1溶液洗脱SR薄膜上目标物,采用气相色谱仪进行检测。结果表明:方法检出限在0.001~0.132μg/L之间,定量限为0.2μg/L;决定系数(R^(2))>0.9973;在0.2、1、20μg/L 3个添加水平下,13种农药在水中OCPs的平均回收率在73%~109%之间,相对标准偏差在0.5%~13%之间(n=5)。利用该方法对巢湖、南淝河等合肥市内主要河流进行了13种OCPs残留的检测,结果发现13种OCPs的最高检出质量浓度为3.64μg/L。与已所报道的方法相比,该方法具有灵敏度高、操作简便、成本低等特点,在环境水体OCPs多残留痕量监测领域具有良好的应用前景。
文摘近年来应用于中高能核物理实验的先进前端读出专用集成电路(application specific integrated circuit,ASIC)芯片呈现出越来越强的数字化趋势,可提高系统的集成度并降低功耗。论文研制了一种高计数率多通道时间测量与串行读出电路(high-count rate multi-channel time measurement and serial readout circuit,HMTRC),可实现核事件去稀疏化、去随机化的读出。该电路主要包括了基于时钟分相技术的时间数字转化器、控制器、先进先出存储器和基于令牌环逻辑的轮询读出模块。HMTRC已被集成到一款自研的16通道前端读出ASIC芯片中,可测量和储存时间信息,并利用数字驱动的前端读出架构实现时间与能量信息同步读出。测试表明,时间分辨率好于2 ns,功能符合预期。
