We investigate theoretically two photon entanglement processes in a photonic-crystal cavity embedding a quantum dot in tile strong-coupling regime. The model proposed by Johne et al. （Johne R, Gippius N A, Pavlovic G...We investigate theoretically two photon entanglement processes in a photonic-crystal cavity embedding a quantum dot in tile strong-coupling regime. The model proposed by Johne et al. （Johne R, Gippius N A, Pavlovic G, Solnyshkov D D, Shelykh I A and Malpuech G 2008 Phys. Rev. Lett. 100 240404）, and by Robert et al. （Robert J, Gippius N A and Malpuech G 2009 Phys. Rev. B 79 155317） is modified by considering irreversible dissipation and incoherent continuous pumping for the quantum dot, which is necessary to connect the realistic experiment. The dynamics of tile system is analysed by employing the Born Markov master equation, through which the spectra for the system are computed as a fnnction of various parameters. By means of this analysis the photon-reabsorption process in the strong- coupling regime is first observed and analysed from the perspective of radiation spectrum and the optimal parameters for observing energy-entangled photon pairs are identified.展开更多
Bohm’s variation of the Einstein-Podolsky-Rosen thought experiment may be used to reveal the path a photon travels in Young’s experiment without destroying the observed interference pattern. Photons emitted by a lig...Bohm’s variation of the Einstein-Podolsky-Rosen thought experiment may be used to reveal the path a photon travels in Young’s experiment without destroying the observed interference pattern. Photons emitted by a light-source with zero spin are incident on a screen with two narrow slits separated by a small distance, with antiparallel polarized photonic spin filters placed in front of both slits. It follows that the slit through which an incident photon passed to form an interference pattern can be determined by performing an intermediate delayed choice measurement. This experimental probe is ideal for penetrating the shroud of mystery surrounding the wave-particle duality exhibited by quantum phenomena.展开更多
Quantum networks strongly depend on the efficient interactions between flying photonic quantum bits and local long-lived atomic matter nodes. To achieve the efficient quantum interfaces between polarization-encoding p...Quantum networks strongly depend on the efficient interactions between flying photonic quantum bits and local long-lived atomic matter nodes. To achieve the efficient quantum interfaces between polarization-encoding photons and spin-encoding atoms, polarization-entangled paired photons with a bandwidth narrower than the natural linewidth of the atoms are highly required. In this paper, we review the generation of subnatural-linewidth polarization-entangled paired photons through spontaneous four-wave mixing with cold atoms, which is very suitable for the application of quantum ne^orks.展开更多
对星地量子测距过程中利用捕获跟踪瞄准(Acquisition tracking and pointing,ATP)系统进行纠缠光子对收发和利用符合计数原理计算纠缠光子对到达时间差(Time difference of arrival,TDOA)的两个关键过程进行了仿真实验研究。根据"...对星地量子测距过程中利用捕获跟踪瞄准(Acquisition tracking and pointing,ATP)系统进行纠缠光子对收发和利用符合计数原理计算纠缠光子对到达时间差(Time difference of arrival,TDOA)的两个关键过程进行了仿真实验研究。根据"墨子号"量子卫星真实的6个轨道参数,对卫星的运动轨迹以及地面用户对从卫星上发射到地面信号的ATP过程进行系统仿真实验研究。分析并设计了ATP系统的结构;借助于Simulink环境下的仿真软件,建立ATP时域仿真系统,将所计算出的"墨子号"方位角与俯仰角位置信号作为ATP系统的输入信号,对所建立的ATP系统进行星地纠缠光收发的捕获跟踪瞄准过程进行了系统仿真实验,跟踪精度达到了2μrad;在实现地面用户对量子卫星的精确跟踪的基础上,设计并进行纠缠光子对收发及其符合计数的仿真实验;拟合出纠缠光子对皮秒级误差的到达时间差,实现了精确的量子测距过程,为量子导航系统的实现提供了一定的理论及仿真实验基础。展开更多
基金supported by the National High Technology Research and Development Program of China (Grant No. 2009AA03Z405)the National Natural Science Foundation of China (Grant Nos. 60908028, 60971068, and 10979065)+1 种基金the Program for New Century Excellent Talents in University (Grant No. NTCE-10-0261)the Chinese Universities Scientific Fund (Grant No. 2011RC0402)
文摘We investigate theoretically two photon entanglement processes in a photonic-crystal cavity embedding a quantum dot in tile strong-coupling regime. The model proposed by Johne et al. （Johne R, Gippius N A, Pavlovic G, Solnyshkov D D, Shelykh I A and Malpuech G 2008 Phys. Rev. Lett. 100 240404）, and by Robert et al. （Robert J, Gippius N A and Malpuech G 2009 Phys. Rev. B 79 155317） is modified by considering irreversible dissipation and incoherent continuous pumping for the quantum dot, which is necessary to connect the realistic experiment. The dynamics of tile system is analysed by employing the Born Markov master equation, through which the spectra for the system are computed as a fnnction of various parameters. By means of this analysis the photon-reabsorption process in the strong- coupling regime is first observed and analysed from the perspective of radiation spectrum and the optimal parameters for observing energy-entangled photon pairs are identified.
文摘Bohm’s variation of the Einstein-Podolsky-Rosen thought experiment may be used to reveal the path a photon travels in Young’s experiment without destroying the observed interference pattern. Photons emitted by a light-source with zero spin are incident on a screen with two narrow slits separated by a small distance, with antiparallel polarized photonic spin filters placed in front of both slits. It follows that the slit through which an incident photon passed to form an interference pattern can be determined by performing an intermediate delayed choice measurement. This experimental probe is ideal for penetrating the shroud of mystery surrounding the wave-particle duality exhibited by quantum phenomena.
基金supported by the National Natural Science Funds of China(Grants Nos.11474107,11104085,and 11204086)the Guangdong Natural Science Funds for Distinguished Young Scholar(Grant No2014A030306012)+2 种基金the Foundation for outstanding young teacher in Higher Education of Guangdong(Grant No.Yq2013050)the Pearl River Nova Program of Guangzhou(Grant No.2014010)the upported by Program for Changjiang Scholars and Innovative Research Team in University(Grant No.IRT1243)
文摘Quantum networks strongly depend on the efficient interactions between flying photonic quantum bits and local long-lived atomic matter nodes. To achieve the efficient quantum interfaces between polarization-encoding photons and spin-encoding atoms, polarization-entangled paired photons with a bandwidth narrower than the natural linewidth of the atoms are highly required. In this paper, we review the generation of subnatural-linewidth polarization-entangled paired photons through spontaneous four-wave mixing with cold atoms, which is very suitable for the application of quantum ne^orks.
文摘对星地量子测距过程中利用捕获跟踪瞄准(Acquisition tracking and pointing,ATP)系统进行纠缠光子对收发和利用符合计数原理计算纠缠光子对到达时间差(Time difference of arrival,TDOA)的两个关键过程进行了仿真实验研究。根据"墨子号"量子卫星真实的6个轨道参数,对卫星的运动轨迹以及地面用户对从卫星上发射到地面信号的ATP过程进行系统仿真实验研究。分析并设计了ATP系统的结构;借助于Simulink环境下的仿真软件,建立ATP时域仿真系统,将所计算出的"墨子号"方位角与俯仰角位置信号作为ATP系统的输入信号,对所建立的ATP系统进行星地纠缠光收发的捕获跟踪瞄准过程进行了系统仿真实验,跟踪精度达到了2μrad;在实现地面用户对量子卫星的精确跟踪的基础上,设计并进行纠缠光子对收发及其符合计数的仿真实验;拟合出纠缠光子对皮秒级误差的到达时间差,实现了精确的量子测距过程,为量子导航系统的实现提供了一定的理论及仿真实验基础。
