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Error-insensitive population transfer in a qutrit by invariant-based shortcuts with optimized drivings

EPL 2019年第6期127卷

作者： Lu, Xiao-Jing Feng, Zhi-Bo Xuchang Univ Sch Elect & Mechatron Engn Xuchang 461000 Peoples R China

We develop an effective scheme for implementing error-insensitive population transfer in a three-level system (qutrit) by invariant-based shortcuts with optimized drivings. Based on the method of inverse engineering, target population transfers can be performed in a shortcut manner. Taking into account the deviation errors and then optimizing the coherent drivings, we can improve the target population transfers to be insensitive to deviations of frequency detuning or Rabi coupling. Particularly, with an appropriate choice of coherent drivings, our scheme could be insensitive to these two kinds of errors simultaneously. As one of the potential applications, our scheme may remove the control errors of quantum operations on superconducting artificial atoms. By combining shortcuts to adiabaticity with optimal control, the protocol could offer a promising avenue to explore fast and robust quantum information processing experimentally. Copyright (C) EPLA, 2019

关键词： optical implementations of quantum information processing and transfer Level crossing and optical pumping Superconducting devices

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Long-distance measurement-device-independent quantum secure direct communication

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EPL 2019年第4期125卷

作者： Gao, Zikai Li, Tao Li, Zhenhua Nanjing Univ Sci & Technol Sch Sci Nanjing 210094 Jiangsu Peoples R China

quantum secure direct communication enables a direct message exchange over a quantum channel without any key generation in advance. Here we present a feasible protocol for long-distance measurement-device-independent quantum secure direct communication. The secure distance is increased by using ancillary entangled photon-pair sources and relay nodes. Meanwhile, its security is independent from measurement devices, which eliminates the potential loophole for eavesdropping in the detection systems. Moreover, this protocol can be implemented with linear optical devices and single-photon detectors. (C) EPLA, 2019

关键词： quantum communication quantum cryptography and communication security optical implementations of quantum information processing and transfer

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quantum transistor with a double-cavity optomechanical system

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EPL 2018年第6期122卷

作者： Xiong, Biao Li, Xun Chao, Shi-Lei Zhou, Ling Dalian Univ Technol Sch Phys Dalian 116024 Peoples R China

A scheme of quantum transistor in a double-cavity optomechanical system is proposed, where the input signal of the base port is a quantum or classical signal which are discussed, respectively. In the case of quantum input signal, to treat the nonlinear trimer interaction, we propose an iterative method when the trimer interaction is weak. When the input signal is classical, we can achieve beam splitter and parametric-down-conversion interaction between collector and emitter, respectively. We calculate the output power spectrum and analyze the relations between input of the base port and output of the emitter. Our results show that the input at the base controls the on-off between the collector and emitter, and the signal imposed from the base can be amplified. For two different cases, the system both can serve as a quantum transistor. Copyright (C) EPLA, 2018

关键词： quantum optics optical implementations of quantum information processing and transfer

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The Leggett-Garg inequality and Page-Wootters mechanism

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EPL 2016年第4期116卷

作者： Gangopadhyay, D. Roy, A. Sinha Ramakrishna Mission Vivekananda Univ Dept Phys Howrah W Bengal India

Violation of the Leggett-Garg inequality (LGI) implies quantum phenomena. In this light we establish that Moreva et al.' s (Phys. Rev. A, 89 (2014) 052122) experiment demonstrating Page-Wootters' mechanism (Page D. N. and Wootters W. K., Phys. Rev. D, 27 (1983) 2885;Wootters W. K., Int. J. Theor. Phys., 23 (1984) 701). falls in the quantum domain. An observer outside a 2-photons world does not detect any change in the 2-photons state, i.e., there is no time parameter for the outside observer. But an observer attached to one of the photons sees the other photon evolving and this means that there is an "internal" time. The LGI is violated for the clock photon whose state evolves with the internal time as measured by the system photon. Conditional probabilities in this 2-photons system are computed for both sharp and unsharp measurements. The conditional probability increases for entangled states as obtained by Page and Wootters for both ideal and also unsharp measurements. Copyright (C) EPLA, 2016

关键词： Foundations of quantum mechanics, measurement theory quantum state engineering and measurements optical implementations of quantum information processing and transfer

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Multivariate quantum memory as controllable delayed multi-port beamsplitter

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EPL 2016年第6期113卷

作者： Vetlugin, A. N. Sokolov, I. V. St Petersburg State Univ 7-9 Univ Skaya Nab St Petersburg 199034 Russia

The addressability of parallel spatially multimode quantum memory for light allows one to control independent collective spin waves within the same cold atomic ensemble. Generally speaking, there are transverse and longitudinal degrees of freedom of the memory that one can address by a proper choice of the pump (control) field spatial pattern. Here we concentrate on the mutual evolution and transformation of quantum states of the longitudinal modes of collective spin coherence in the cavity-based memory scheme. We assume that these modes are coherently controlled by the pump waves of the on-demand transverse profile, that is, by the superpositions of waves propagating in the directions close to orthogonal to the cavity axis. By the write-in, this allows one to couple a time sequence of the incoming quantized signals to a given set of superpositions of orthogonal spin waves. By the readout, one can retrieve quantum states of the collective spin waves that are controllable superpositions of the initial ones and are coupled on demand to the output signal sequence. In a general case, the memory is able to operate as a controllable delayed multi-port beamsplitter, capable of transformation of the delays, the durations and time shapes of signals in the sequence. We elaborate the theory of such light-matter interface for the spatially multivariate cavity-based off-resonant Raman-type quantum memory. Since, in order to speed up the manipulation of complex signals in multivariate memories, it might be of interest to store relatively short light pulses of a given time shape, we also address some issues of the cavity-based memory operation beyond the bad cavity limit. Copyright (C) EPLA, 2016

关键词： quantum state engineering and measurements Coherent control of atomic interactions with photons optical implementations of quantum information processing and transfer

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Nitride quantum light sources

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EPL 2016年第3期113卷

作者： Zhu, T. Oliver, R. A. Univ Cambridge Dept Mat Sci & Met 27 Charles Babbage Rd Cambridge CB3 0FS England

Prototype nitride quantum light sources, particularly single-photon emitters, have been successfully demonstrated, despite the challenges inherent in this complex materials system. The large band offsets available between different nitride alloys have allowed device operation at easily accessible temperatures. A wide range of approaches has been explored: not only self-assembled quantum dot growth but also lithographic methods for site-controlled nanostructure formation. All these approaches face common challenges, particularly strong background signals which contaminate the single-photon stream and excessive spectral diffusion of the quantum dot emission wavelength. If these challenges can be successfully overcome, then ongoing rapid progress in the conventional III-V semiconductors provides a roadmap for future progress in the nitrides. Copyright (C) EPLA, 2016

关键词： quantum dots III-V semiconductors optical implementations of quantum information processing and transfer

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Geometric quantum phase for displaced states for a particle with an induced electric dipole moment

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EPL 2016年第2期115卷

作者： Lemos de Melo, J. Bakke, K. Furtado, C. Univ Fed Reconcavo Bahia Ctr Ciencias Exatas & Tecnol Cruz Das Almas BA Brazil Univ Fed Paraiba Dept Fis Caixa Postal 5008 BR-58051970 Joao Pessoa PB Brazil

Basing on the analogue Landau levels for a neutral particle possessing an induced electric dipole moment, we show that displaced states can be built in the presence of electric and magnetic fields. Besides, the Berry phase associated with these displaced quantum states is obtained by performing an adiabatic cyclic evolution in series of paths in parameter space. Copyright (C) EPLA, 2016

关键词： Phases: geometric, dynamic or topological quantum computation architectures and implementations optical implementations of quantum information processing and transfer

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Addressing single trapped ions for Rydberg quantum logic

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JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND optical PHYSICS 2016年第15期49卷

作者： Bachor, P. Feldker, T. Walz, J. Schmidt-Kaler, F. Johannes Gutenberg Univ Mainz Inst Phys QUANTUM Staudingerweg 7 D-55128 Mainz Germany Helmholtz Inst Mainz Johann Joachim Becherweg 36 D-55128 Mainz Germany

We demonstrate the excitation of ions to the Rydberg state 22F by vacuum ultraviolet radiation at a wavelength of 123 nm combined with the coherent manipulation of the optical qubit transition in Ca-40(+). With a tightly focused beam at 729 nm wavelength we coherently excite a single ion from a linear string into the metastable 3D(5/2) state before a VUV pulse excites it to the Rydberg state. In combination with ion shuttling in the trap, we extend this approach to the addressed excitation of multiple ions. The coherent initialization as well as the addressed Rydberg excitation are key prerequisites for more complex applications of Rydberg ions in quantum simulation or quantum information processing.

关键词： trapped ions Rydberg states optical implementations of quantum information processing and transfer

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transfer of optical signals around bends in two-dimensional linear photonic networks

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JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND optical PHYSICS 2015年第3期48卷

作者： Nikolopoulos, G. M. FORTH Inst Elect Struct & Laser GR-70013 Iraklion Greece

The ability to navigate light signals in two-dimensional networks of waveguide arrays is a prerequisite for the development of all-optical integrated circuits for information processing and networking. In this article, we present a theoretical analysis of bending losses in linear photonic lattices with engineered couplings, and discuss possible ways for their minimization. In contrast to previous work in the field, the lattices under consideration operate in the linear regime, in the sense that discrete solitons cannot exist. The present results suggest that the functionality of linear waveguide networks can be extended to operations that go beyond the recently demonstrated point-to-point transfer of signals, such as blocking, routing, logic functions, etc.

关键词： optical implementations of quantum information processing and transfer quantum communication waveguides couplers and arrays

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Ghost imaging using labyrinth-like phase modulation patterns for high-efficiency and high-security optical encryption

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EPL 2015年第1期109卷

作者： Chen, Wen Chen, Xudong Natl Univ Singapore Dept Elect & Comp Engn Singapore 117583 Singapore

Ghost imaging has attracted more and more current attention due to its marked physical characteristics, and many physical applications, such as sensing and optical security, have been explored. In this letter, we propose ghost imaging using labyrinth-like phase modulation patterns for optical encryption. Since only one phase-only mask should be pre-set and the labyrinth patterns occupy only few spaces, high-efficiency storage or transmission of system keys can be implemented. In addition, each labyrinth pattern (i.e., phase modulation pattern) possesses high randomness and flexibility, hence high security can be guaranteed for the proposed optical encryption. Copyright (C) EPLA, 2015

关键词： Imaging and optical processing Photon statistics and coherence theory optical implementations of quantum information processing and transfer

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