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quantum interference between heralded single photon state and coherent state

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Chinese Physics B 2017年第7期26卷 111-116页

作者：杨磊马晓欣李小英 College of Precision Instrument and Opto-Electronics Engineering Tianjin UniversityKey Laboratory of Opto-Electronics Information Technology Ministry of Education High School Affiliated to Beijing Institute of Technology

Balanced homodyne detection has been introduced as a reliable technique of reconstructing the quantum state of a single photon Fock state, which is based on coupling the single photon state and a strong coherent local oscillator in a beam splitter and detecting the field quadrature at the output ports separately. The main challenge associated with a tomographic characterization of the single photon state is mode matching between the single photon state and the local oscillator. Utilizing the heralded single photon generated by the spontaneous parametric process, the multi-mode theoretical model of quantum interference between the single photon state and the coherent state in the fiber beam splitter is ***, the analytical expressions of the temporal-mode matching coefficient and interference visibility and relationship between the two parameters are shown. In the experimental scheme, the interference visibility under various temporalmode matching coefficients is demonstrated, which is almost accordant with the theoretical value. Our work explores the principle of temporal-mode matching between the single photon state and the coherent photon state, originated from a local oscillator, and could provide guidance for designing the high-performance balanced homodyne detection system.

关键词： heralded single photon state coherent state quantum interference balanced homodyne detection

quantum interference of Dual-Channel Excited Magnons in Spin-1 Bose-Einstein Condensates Atomic Chain

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Communications in Theoretical Physics 2013年第7期60卷 19-24页

作者： ZHAO Xu ZHAO Xing-Dong ZHOU Lu JING Hui ZHANG Wei-Ping Shanghai Institute of Quality Inspection and Technical Research (SQI) Shanghai Alpha Lighting Equipment Testing Ltd. (SALT) Shanghai 201114 China State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University Shanghai 200062 China College of Physics and Electronic Engineering Henan Normal University Xinxiang 453007 China

We investigate the quantum interference of spin wave excitations of a spin-1 atomic Bose condensate confined in an optical lattice. Single-channel and dual-channel interactions are employed in our system, and their induced excitations are compared. Also we consider the interplay of magneto-optical excitations, which leads to a constructive or destructive effect for the creation of magnons based on background excitations. The population distributions of excited magnons can be well controlled by steering the long-range dipole-dipole interactions. Such a scheme can be used to demonstrate conventional quantum-optical phenomena like dynamical Casimir effect at finite temperatures.

关键词： MDDI LDDi quantum interference constructive effect destructive effect

quantum interference enhanced thermopower in single-molecule thiophene junctions

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Chinese Chemical Letters 2022年第1期33卷 523-526页

作者： Hang Chen Yaorong Chen Hewei Zhang Wenqiang Cao Chao Fang Yicheng Zhou Zongyuan Xiao Jia Shi Wenbo Chen Junyang Liu Wenjing Hong State Key Laboratory of Physical Chemistry of Solid Surfaces iChEMCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric PowerShanghai 200090China Beijing National Laboratory for Molecular Sciences Beijing 100190China

quantum interference(QI)effects,which offer unique opportunities to widely manipulate the charge transport properties in the molecular junctions,will have the potential for achieving high *** we developed a scanning tunneling microscope break junction technique to investigate the thermopower through single-molecule thiophene *** observed that the thermopower of 2,4-TPSAc with destructive quantum interference(DQI)was nearly twice of 2,5-TP-SAc without DQI,while the conductance of the 2,4-TP-SAc was two orders of magnitude lower than that of 2,***,we found the thermopower was almost the same by altering the anchoring group or thiophene core in the control experiments,suggesting that the QI effect is responsible for the increase of *** density functional theory(DFT)calculations are in quantitative agreement with the experimental *** results reveal that QI effects can provide a promising platform to enhance the thermopower of molecular junctions.

关键词： quantum interference Thermopower Thermoelectric device Single-molecule electronics Single-molecule junctions

quantum interference effects on the probe amplification without and with inversion in a four-level system

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Chinese Physics B 2004年第10期13卷 1722-1727页

作者：张冰徐卫华张惠芳高锦岳 CollegeofPhysics JilinUniversityChangchun130023China KeyLaboratoryofCoherentLight AtomicandMolecularSpectroscopyEducationMinistryofChinaChina

A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.

关键词： quantum interference probe gain inversion non-inversion

Phase-dependent quantum interference between different pathways in bichromatic harmonic generation

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Chinese Physics B 2009年第4期18卷 1458-1462页

作者：蔡俊王黎明乔豪学 Department of Physics Wuhan University

This paper studies the harmonic generation of the hydrogen atom subjected to a collinear bichromatic laser field by numerically solving the time-dependent Schrbdinger equation using the split-operator pseudo-spectral method. By adding a frequency variation to the additional field, the contributions of different pathways to particular order harmonic generation can be isolated. The quantum interference pattern between harmonic pathways, which influences the harmonic intensity, is found to be either constructive or destructive with respect to different relative phase of the two field components. Detailed description of up to the 35th-order harmonics and the harmonic pathways for a wide range of field parameters is presented.

关键词： harmonic pathway quantum interference split-operator pseudo-spectral method

A Novel Observation of ＂a Sharp Absorption Line＂ Using Much More Broad Laser Lights： quantum interference in the Autoionization Spectra of Sc

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Chinese Physics Letters 2010年第5期27卷 84-86页

作者：钟志萍高翔张小乐李家明 Department of Physics and Key Laboratory of Atomic and Molecular Nanosciences of the Education Ministry Tsinghua University Beijing 100084 Department of Physics Graduate School Chinese Academy of Sciences Beijing 100080 Department of Physics Shanghai Jiao Tong University Shanghai 200240

The most accurate measturements in physical sciences will be precision spectroscopic experiments which are based on the usage of most narrow lines in cooperation with interference phenomena. We present a novel experimental observation of ＂a sharp absorption resonance line＂ with much more broad laser lights. The mechanism of such a novel phenomenon will be elucidated and its implications will be discussed.

关键词： LASER beams quantum optics AUGER effect SCANDIUM PHYSICAL measurements quantum interference SPECTRUM analysis

Generation and quantum interference of Entangled Electron-Hole Pairs in a Hanbury Brown and Twiss Interferometer

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Chinese Physics Letters 2010年第9期27卷 191-194页

作者：张青云王伯根沈瑞邢定钰 National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093

The Hanbury Brown-Twiss interferometer is proposed to serve as a detector of the crossed Andreev reflection and to generate entangled electron-hole pairs. It is shown that the non-local electron and hole induced by the crossed Andreev reflection are entangled. quantum interference of the entangled electron-hole pairs gives rise to a new measurable effect of the phase difference between two superconductors in the cross correlation. The present theoretical predictions can be experimentally realized within the present-day microelectronic technology.

关键词： quantum interference EXCITON theory INTERFEROMETERS SUPERCONDUCTORS MICROELECTRONICS PREDICTION theory

Further Study of A-Related quantum interference of H-State Diatomic on Collision-Induced Rotational Energy Transfer

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Communications in Theoretical Physics 2005年第2X期44卷 347-352页

作者： LI Yong-Qing SONG Peng CHEN Yue-Hui WANG Wei-Li MA Feng-Cai Department of Physics Liaoning University Shenyang 110036 China

In our previous theoretical studies [Meng-Tao Sun, Yong-Qing Lee, and Feng-Cai Ma, Chem. ***. 371 （2003） 342], we have reported the quantum interference on collision-induced rotational energy transfer on CO （A ^1 Π,v = 3） with inert gases, which originates from the difference between the two A-related collision potential energy surfaces. The interference angle, which measures the degree of coherence, is presented in this paper. Based on the time-dependent first order Born approximation, taking into account the anisotropic Lennard-Jones interaction potentials, the relation of the interference angle with the factors, including experimental temperature, partner, and rotational quantum number, are obtained. The changing tendencies with them are discussed. This theoretical model is important to understanding and performing this kind of experiment.

关键词： quantum interference rotational energy transfer interference angle

Dynamical effects of the four-wave mixing enhancement induced by constructive quantum interference

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Chinese Physics B 2011年第3期20卷 203-209页

作者：薛艳王刚吴金辉张冰高锦岳 College of Physics Jilin UniversityChangchun 130023China Key Lab of CLAMS of Educational Ministry

In a four-level system of ultracold STRb atoms, through analytical and numerical calculations we propose an efficient scheme to achieve the enhanced four-wave mixing process and demonstrate its dynamical control by various parameters such as the travel distance z, probe detuning δ and the probe pulse width T. In particular, we find that the maximal intensity of the nonlinearly generated signal pulse can be about 80% of the initial input probe under the optimal condition. This greatly enhanced conversion efficiency occurs due to the constructive quantum interference between two different components of the generated signal pulse.

关键词： four-wave mixing quantum interference