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国家自然科学基金(61178010)

作品数:5 被引量:2H指数:1
相关作者:刘宏伟李瑞雪朱武韦克金马海强更多>>
相关机构:北京邮电大学更多>>
发文基金:国家自然科学基金中央高校基本科研业务费专项资金国家重点实验室开放基金更多>>
相关领域:理学机械工程电子电信更多>>

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5 条 记 录,以下是 1-5
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Afterpulsing characteristics of InGaAs/InP single photon avalanche diodes
2014年
In Ga As/In P single photon avalanche diodes(SPADs) are more and more available in many research fields. They are affected by afterpulsing which leads to a poor single photon detection probability. We present an In Ga As/In P avalanche photodiode with an active quenching circuit on an application specific integrated circuit(ASIC). It can quench the avalanche rapidly and then reduce the afterpulse rate. Also this quenching circuit can operate in both free-running and gated modes.Furthermore, a new technique is introduced to characterize the influence of the higher order of afterpulses, which uses a program running on a field programmable gate array(FPGA) integrated circuit.
马海强杨建会韦克金李瑞雪朱武
Entanglement concentration for an arbitrary hybrid less-entangled state and W state using quantum dots and a microcavity coupled system
2012年
We propose a practical entanglement concentration protocol (ECP) for a hybrid entangled state using quantum dots and a microcavity coupled system. A hybrid less-entangled state can he concentrated to a most-entangled state with a certain probability using only one ancillary single photon. Moreover, using this protocol, we can also concentrate an arbitrary three-particle less-entangled W state using two ancillary photons and classical communication. The proposed protocols provide us with a useful method to concentrate less-entangled states, which can he implemented with current technology.
曹聪王川张茹
关键词:MICROCAVITY
光纤量子密钥分发系统中的偏振无关相位调制被引量:1
2016年
提出并实验验证了一种简单稳健的实现偏振无关相位调制的方法。基于偏振相关的相位调制器,借助法拉第旋转镜,根据光在反射前和反射后的偏振状态的变化,实现了光的偏振无关的调制,实验的中心波长为1550 nm,可见度达到96.96%,且可长时间保持稳定。将其应用于"即插即用"的量子密钥分配方案中有效地保证了传输的稳定性和实用性。
李瑞雪马海强韦克金朱武刘宏伟
关键词:量子光学量子密钥分配即插即用偏振无关相位调制
A full quantum network scheme
2014年
We present a full quantum network scheme using a modified BB84 protocol. Unlike other quantum network schemes, it allows quantum keys to be distributed between two arbitrary users with the help of an intermediary detecting user. Moreover, it has good expansibility and prevents all potential attacks using loopholes in a detector, so it is more practical to apply. Because the fiber birefringence effects are automatically compensated, the scheme is distinctly stable in principle and in experiment. The simple components for every user make our scheme easier for many applications. The experimental results demonstrate the stability and feasibility of this scheme.
马海强韦克金杨建会李瑞雪朱武
Quantum discord in the three-spin XXZ chain with Dzyaloshinskii-Moriya interaction被引量:1
2012年
The quantum discord(QD) of a three-qubit Heisenberg XXZ system with the Dzyaloshinskii-Moriya(DM) interaction parameter is investigated,and the three-qubit QD under Ornstein-Uhlenbeck noise is calculated.We find that both DM interaction parameter D z and anisotropic parameter J z can increase QD and entanglement but D z is a more efficient parameter in the antiferromagnetic case.We observe a complex range of QD with the change of D z and a sudden change of QD with the variation of J z in the ferromagnetic case.We show that the decrease durations of both QD and entanglement can be prolonged by increasing DM interaction and reducing noise bandwidth in the evolutionary process.
ZHU YinYanZHANG Yong
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