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| 1 | Generation of GHZ-like and cluster-like quadripartite entangled states for continuous variable using a set of quadrature squeezed states显示文摘We designed the experimental generation system of the optical GHZ-like and cluster-like quadripartite entangled states for continuous variables.We theoretically demonstrated that the two different types of quadripartite entangled states can be obtained by the linearly optical transformation of four amplitude-quadrature and phase-quadrature squeezed states produced from a pair of nondegenerate optical parametric amplifiers under appropriate phase relations.The criteria for full inseparability of quadripartite cluster-like state were deduced,and the dependency of the quadripartite entanglement on the initial squeezing degree,the transmission efficiencies of the system and the detection efficiency of homodyne detection were numerically calculated. | SU XiaoLong JIA XiaoJun XIE ChangDe PENG KunChi | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，1： | 12 |
| 2 | Quantum storage of optical signals and coherent manipulation of quantum states based on electromagnetically induced transparency显示文摘Electromagnetically induced transparency (EIT) techniques are important tools for the storage of the quantum states of light fields in atomic ensembles and for enhancement of the interaction between photons. In this paper, we briefly summarize the recent experimental studies conducted by our group on enhanced cross-phase modulation based on double EIT effects, the quantum interference of stored dual-channel spin-wave excitations and the coherent manipulation of the spin wave vector for the polarization of photons in a single tripod atomic system. The work presented here has potential application in the developing field of quantum information processing. | WANG Hai XIE ChangDe PENG KunChi | 2012 | Chinese Science Bulletin2012，57，16： | 4 |
| 3 | Characterizing optical dipole trap via fluorescence of trapped cesium atoms显示文摘Optical dipole trap (ODT) is becoming an important tool of manipulating neu- tral atoms. In this paper ODT is realized with a far-off resonant laser beam strongly fo- cused in the magneto-optical trap (MOT) of cesium atoms. The light shift is measured by simply monitoring the fluorescence of the atoms in the magneto-optical trap and the opti- cal dipole trap simultaneously. The advantages of our experimental scheme are discussed, and the effect of the beam waist and power on the potential of dipole trap as well as heating rate is analyzed. | LIU Tao GENG Tao YAN Shubin LI Gang ZHANG Jing WANG Junmin PENG Kunchi ZHANG Tiancai | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，3： | 4 |
| 4 | Preparation of multipartite entangled states used for quantum information networks显示文摘The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation.In this paper,we review the experimental progress in the preparation of cluster states and multi-color entangled states with continuous variables.The preparation of lager scale multipartite entangled state provide valuable quantum resources to implement more complex quantum informational tasks. | SU XiaoLong JIA XiaoJun XIE ChangDe PENG KunChi | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，7： | 4 |
| 5 | Experimental test of error-disturbance uncertainty relation with continuous variables显示文摘The uncertainty relation is one of the fundamental principles in quantum mechanics and plays an important role in quantum information science. We experimentally test the error-disturbance uncertainty relation(EDR) with continuous variables for Gaussian states. Two incompatible continuous-variable observables, amplitude and phase quadratures of an optical mode, are measured simultaneously using a heterodyne measurement system.The EDR values with continuous variables for coherent, squeezed, and thermal states are verified experimentally.Our experimental results demonstrate that Heisenberg’s EDR with continuous variables is violated, while Ozawa’s and Branciard’s EDRs with continuous variables are validated. | Yang Liu Haijun Kang Dongmei Han Xiaolong Su Kunchi Peng | 2019 | Photonics Research2019，7，11： | 3 |
| 6 | Quantum network based on non-classical light显示文摘Quantum network enables quantum communication among quantum nodes and provides advantages that are unavailable in any classical network.Based on rapidly developing science and technology in quantum communication,the studies on quantum network have also made important progresses recent years.In this study,we briefly review the experimental progresses in building quantum network based on optical field and discuss the challenges toward a quantum Internet. | Xiaolong SU Meihong WANG Zhihui YAN Xiaojun JIA Changde XIE Kunchi PENG | 2020 | Science China(Information Sciences)2020，63，8： | 3 |
| 7 | Quantifying quantum coherence of optical cat states显示文摘The optical cat state plays an essential role in quantum computation and quantum metrology. Here, we experimentally quantify quantum coherence of an optical cat state by means of relative entropy and the l1 norm of coherence in a Fock basis based on the prepared optical cat state at the rubidium D1 line. By transmitting the optical cat state through a lossy channel, we also demonstrate the robustness of quantum coherence of the optical cat state in the presence of loss, which is different from the decoherence properties of fidelity and Wigner function negativity of the optical cat state. Our results confirm that quantum coherence of optical cat states is robust against loss and pave the way for the application of optical cat states. | MIAO ZHANG HAIJUN KANG MEIHONG WANG FENGYI XU XIAOLONG SU KUNCHI PENG | 2021 | Photonics Research2021，9，5： | 2 |
| 8 | Quantum teleportation and dense coding by means of bright amplitude- squeezed light and direct measurement of a Bell state 显示文摘 | PENG Kunchi | 2000 | Phys Rev A2000，62，06： | 1 |
| 9 | Generation of twomode quadrature-phase squeezing and intensity-difference squeezing from a cw-NOPO 显示文摘 | PENG Kunchi PAN Qing WANG Hai | 1998 | Appl Phys B1998，66，6： | 1 |
| 10 | A high-power single-frequency 540 nm laser obtained by intracavity frequency doubling of an Nd:YAP laser显示文摘 | Zheng Yaohui Wang Yajun Peng Kunchi | 2012 | Chin Phys Lett2012，29，04： | 1 |
| 11 | Multiparty secret sha- ring of quantum information based on entanglement swapping 显示文摘 | Li Yongmin Zhang Kuanshou Peng Kunchi | 2004 | Physical Letters A2004，324，56： | 1 |
| 12 | Quantum teleportation and densecoding by means of bright amplitude-squeezed light and direct measurement of a Bell state 显示文摘 | Zhang Jing Peng Kunchi | 2000 | Phys Rev A2000，62，64： | 1 |
| 13 | Entanglement swapping using nondegenerate optical parametric amplifier 显示文摘 | XIE Changde PENG Kunchi | 2002 | Phys Lett A2002，299，： | 1 |
| 14 | CW Self-Frequency-Doubling Laser Operating on Nd:MgO:LiNbO_(3) High-Gain Polarization显示文摘The CW second-harmonic wave of high-gain polarization atλ=l.085μm was demonstrated with Nd:MgO:LiNbO_(3) self-frequency-doubling laser cavity inserted with a quarter wave-plate of the fundamental wavelength.The pump power threshold for the second-harmonic generation as low as 9.9mW was achieved.The maximum second-harmonic output was 11.4 m W,the conversion efficiency for the total second-harmonic output was 11.3%per Watt. | LI Ruining WANG Junmin LIANG Xiaoyan XIE Changde PENG Kunchi XU Guanfeng | 1993 | Chinese Physics Letters1993，10，4： | 0 |
| 15 | Mutually testing source-device-independent quantum random number generator显示文摘Quantum random numbers have an incomparable advantage over pseudo-random numbers since randomness originates from intrinsic property of quantum mechanics.The generation rate and the security of quantum random numbers are two significant indicators of a quantum random number generator(QRNG)for practical applications.Here we propose a mutually testing source-device-independent QRNG by simultaneously measuring a pair of conjugate quadratures from two separate parts of an untrusted continuous-variable quantum state.The amounts of randomness of the quadratures can be mutually estimated by each other via entropic uncertainty principle.Instead of randomly toggling between the conjugate quadratures of one state for collecting different types of data,two quadratures can generate check data and raw bits simultaneously and continuously in this mutually testing manner,which enhances the equivalent generation rate of private random bits to around 6 Gbit/s with a 7.5 mW laser beam.Moreover,the overall security is also improved by adjusting the conditional min-entropy in real time according to the continually monitored fluctuations of the local oscillator and the randomly measured electronic noise of homodyne detectors. | Jialin Cheng Jiliang Qin Shaocong Liang Jiatong Li Zhihui Yan Xiaojun Jia Kunchi Peng | 2022 | Photonics Research2022，10，3： | 0 |
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