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Photoionisation detection of a single Er3+ ion with sub-100-ns time resolution

National Science Review 2024年第4期11卷 38-45页

作者： Yangbo Zhang Wenda Fan Jiliang Yang Hao Guan Qi Zhang Xi Qin Changkui Duan Gabriele G.de Boo Brett C.Johnson Jeffrey C.Mc Callum Matthew J.Sellars Sven Rogge Chunming Yin Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China CAS Center for Excellence in quantum Information and quantum Physics University of Science and Technology of China Hefei National Laboratory University of Science and Technology of China centre of Excellence for quantum computation and communication technology School of Physics University of New South Wales centre of Excellence for quantum computation and communication technology School of Engineering RMIT University centre of Excellence for quantum computation and communication technology School of Physics University of Melbourne centre of Excellence for quantum computation and communication technology Research School of Physics and Engineering Australian National University

Efficient detection of single optical centres in solids is essential for quantum information processing, sensing and single-photon generation *** this work,we use radio-frequency（RF） reflectometry to electrically detect the photoionisation induced by a single Er3+ion in *** high bandwidth and sensitivity of the RF reflectometry provide sub-100-ns time resolution for the photoionisation *** this technique,the optically excited state lifetime of a single Er3+ion in a Si nano-transistor is measured for the first time to be 0.49±0.04μ*** results demonstrate an efficient approach for detecting a charge state change induced by Er excitation and *** approach could be used for fast readout of other single optical centres in solids and is attractive for large-scale integrated optical quantum systems thanks to the multi-channel RF reflectometry demonstrated with frequency multiplexing techniques.

关键词： single optical centres erbium ions RF reflectometry photoionisation detection

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quantum feedback networks and control:A brief survey

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Chinese Science Bulletin 2012年第18期57卷 2200-2214页

作者： JAMES Matthew R arc centre for quantum computation and communication technology Research School of EngineeringAustralian National UniversityCanberraACT 0200Australia

The purpose of this paper is to provide a brief review of some recent developments in quantum feedback networks and control.A quantum feedback network (QFN) is an interconnected system consisting of open quantum systems linked by free fields and/or direct physical *** network constructs,including series connections as well as feedback loops,are *** quantum feedback network theory provides a natural framework for analysis and *** properties such as dissipation,stability,passivity and gain of open quantum systems are *** system design is also discussed,primarily in the context of open linear quantum stochastic *** issue of physical realizability is discussed,and explicit criteria for stability,positive real lemma,and bounded real lemma are *** for linear quantum systems,coherent H∞ and LQG control are described.

关键词：开放量子系统反馈网络控制系统有界实引理 LQG控制网络结构反馈回路网络理论

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Multiparticle Generalization of Teleportation

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Chinese Physics Letters 2000年第3期17卷 162-164页

作者： YANG Chui-Ping GUO Guang-Can Laboratory of quantum communication and quantum computation University of Science and Technology of ChinaHefei 230026

A scheme for teleporting an unknown quantum state of many particles is *** scheme operates essentially by prearranging the sharing of an Einstein-Podolsky-Rosen-correlated pair of particles every *** show that after performing a series of Bell-state measurements and single-particle unitary transformations,the unknown state of many particles,which was destroyed at one place,can be reconstructed at another *** scheme is actually obtained by generalizing an earlier scheme of Bennett et al.[***.70(1993)1895;76(1996)722]known as quantum teleportation to the multiparticle case.

关键词： scheme particle quantum

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Telebroadcasting of a Cat-like State via Local Operations

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Chinese Physics Letters 2001年第9期18卷 1159-1162页

作者： WEN Hai-Dan LI Chuan-Feng GUO Guang-Can Laboratory of quantum communication and quantum computation and Department of Physics University of Science and Technology ofChinaHefei 230026

The quantum telebroadcasting of a cat-like state in combination with the quantum teleportation and the local copying of entanglement is presented. This gives a general way of distributing entanglement among distant pa... 详细信息

关键词： quantum technology. local

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Fourth-Order Interference in Femtosecond Spontaneous Parametric Down-Conversion

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Chinese Physics Letters 2000年第10期17卷 726-727页

作者： JIANG Yun-Kun SHI Bao-Sen LI Jian FAN xiao-feng GUO Guang-Can Laboratory of quantum communication and quantum computation Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026

We report a fourth-order interference experiment in which pairs of photons are produced in spontaneous parametric down-conversion pumped by femtosecond pulses interfere in a Hong-Ou-Mandel *** visibilityof the interfe... 详细信息

关键词： theory. exceeding parametric

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Two-Photon Interference with the Type Ⅱ Spontaneous Parametric Down-Conversion

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Chinese Physics Letters 2001年第1期18卷 45-47页

作者： JIANG Yun-Kun SHI Bao-Sen LI Jian DUAN Kai-Min FAN Xiao-Feng GUO Guang-Can Laboratory of quantum communication&quantum computation and Department of PhysicsUniversity of Science&Technology of ChinaHefei 230026

The two-photon polarized entangled state is generated from the typeⅡspontaneous parametric down-conversion pumped by a femtosecond *** two-photon interference is observed in the Hong-Ou-Mandel *** high visibility of ... 详细信息

关键词： narrow polarized parametric

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Probabilistic Teleportation of the Three-Particle Entangled State via Entanglement Swapping

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Chinese Physics Letters 2001年第8期18卷 1004-1006页

作者： LU Hong Laboratory of quantum communication and quantum computation University of Science and Technology of ChinaHefei 230026 Department of Physics Foshan UniversityFoshan 528000

A scheme of teleportation of a three-particle entangled state via entanglement swapping is *** is shown that if a two-particle entangled state and a three-particle entangled state(both are not maximum entangled states... 详细信息

关键词： particle state probabilistic

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Taking tomographic measurements for photonic qubits 88 ns before they are created

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Chinese Physics B 2021年第4期30卷 55-60页

作者： Zhibo Hou Qi Yin Chao Zhang Han-Sen Zhong Guo-Yong Xiang Chuan-Feng Li Guang-Can Guo Geoff J.Pryde Anthony Laing Key Laboratory of quantum Information University of Science and Technology of ChinaCASHefei 230026China Synergetic Innovation Center of quantum Information and quantum Physics University of Science and Technology of ChinaHefei 230026China centre for quantum computation and communication technology(CQC2T)and centre for quantum Dynamics Griffith UniversityBrisbane4111Australia quantum Engineering and technology Laboratories School of Physics and Department of Electrical and Electronic EngineeringUniversity of BristolUK

We experimentally demonstrate that tomographic measurements can be performed for states of qubits before they are prepared.A variant of the quantum teleportation protocol is used as a channel between two instants in time,allowing measurements for polarization states of photons to be implemented 88 ns before they are *** data taken at the early time and later unscrambled according to the results of the protocol’s Bell measurements,produces density matrices with an average fidelity of 0.90±0.01 against the ideal states of photons created at the later *** tomography of the time reverse quantum channel finds an average process fidelity of 0.84±*** our proof-of-principle implementation necessitates some post-selection,the general protocol is deterministic and requires no post-selection to sift desired states and reject a larger ensemble.

关键词： teleportation tomography time reverse

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Two Theorems on Calculating the Relative Entropy of Entanglement

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Chinese Physics Letters 2001年第2期18卷 160-162页

作者： WU Sheng-Jun WU Qiang ZHANG Yong-De Laboratory of quantum communication and quantum computation and Department of Modern Physics University of Science and Technology of ChinaHefei 230027 Department of Astronomy and Applied Physics University of Science and Technology of ChinaHefei 230026

We present two theorems on calculating the relative entropy of *** 1 is an extension of Vedral and Plenio's theorem(***.A 57(1998)1619)for pure states,which is useful for calculating the relative entropy of entanglement for all pure states as well as for a class of mixed *** 2 gives the relative entropy of entanglement for any bipartite state whose tripartite purification has two separable reduced bipartite states.

关键词： states bipartite entropy

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Memory-enhanced noiseless cross-phase modulation

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Light(Science & Applications) 2012年第1期1卷 6-10页

作者： Mahdi Hosseini Stojan Rebic Ben M Sparkes Jason Twamley Ben C Buchler Ping K Lam centre for quantum computation and communication technology Department of Quantum ScienceThe Australian National UniversityCanberraAustralia centre for Engineered quantum Systems Department of Physics&AstronomyMacquarie UniversityNorth Ryde NSW 2109Australia

Large nonlinearity at the single-photon level can pave the way for the implementation of universal quantum ***,realizing large and noiseless nonlinearity at such low light levels has been a great challenge for scientists in the past ***,we propose a scheme that enables substantial nonlinear interaction between two light fields that are both stored in an atomic *** and quantum simulations demonstrate the feasibility of achieving large cross-phase modulation(XPM)down to the single-photon *** proposed scheme can be used to implement parity gates from which CNOT gates can be ***,we present a proof of principle experimental demonstration of XPM between two optical pulses:one stored and one freely propagating through the memory medium.

关键词： CNOT gate cross-phase modulation electromagnetically induced transparency parity gate quantum memory

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