Generation of twin beams from an optical parametric oscillator pumped by a frequency-doubled diode laser

Hayasaka, Kazuhiro; Zhang, Yun; Kasai, Katsuyuki

doi:10.1364/ol.29.001665

Cited by 32 publications

(14 citation statements)

References 16 publications

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“…PNES can be generated by means of parametric processes, either in optical oscillators or amplifiers [10]. Generation of PNES have been reported with photon-number statistics varying from sub-Poisson [11] to superPoisson [12][13][14]. As a matter of fact, several quantum communication schemes and QKD protocols have been proposed exploiting PNES correlations with coding based on the beams intensity [6,15] or intensity difference [16].…”

Section: Binary Communication With Photon-number Entangled Statesmentioning

confidence: 99%

Quantum communication with photon-number entangled states and realistic photodetection

Usenko

Paris

2010

Physics Letters A

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We address the effects of realistic photodetection, with nonunit quantum efficiency and background noise (dark counts), on the performances of quantum communication schemes based on photon-number entangled states (PNES). We consider channels based on Gaussian twin-beam states (TWB) and nonGaussian two-mode coherent states (TMC) and evaluate the channel capacity by optimizing the bit discrimination threshold. We found that TWB-based channels are more robust against noise than TMCbased ones and that this result is almost independent on the statistics of dark counts.

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Section: Binary Communication With Photon-number Entangled Statesmentioning

confidence: 99%

Quantum communication with photon-number entangled states and realistic photodetection

Usenko

Paris

2010

Physics Letters A

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“…Another experiment to produce the entanglement state was done by Wenger et al [62,63]. In this experiment, a pulsed entanglement state was generated using a traveling-wave OPA pumped at 423 nm by a frequency doubled pulsed Ti:Sapphire laser beam.…”

Section: Experiments On Generation Entanglement State From Below Thrementioning

confidence: 99%

Generation of non-classical states from an optical parametric oscillator/amplifier and their applications

Zhang

2008

Front. Phys. China

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Quantum information and quantum optics are rapidly advancing areas of modern physics. As an important device in quantum optics and quantum information, the optical parametric amplifier/oscillator (OPA/O) has been extensively studied and applied to the generation of non-classical state since the 1980s. This article reviews the progress in the generation of nonclassical state from an OPO/A and application of twin beams in quantum optics and quantum information.Keywords entanglement, optical parametric oscillator, squeezed state, twin beams PACS numbers 42.50.Dv, 03.67.Dd Non-classical states or quantum states are arguably the important resource in the field of quantum information [1, 2] and quantum optics. The most well-known nonclassical state of light is the so-called squeezed state. It is special since its optical noise is redistributed such that its noise is less than the standard quantum noise limit in one quadrature while the fluctuations are larger in the correspondingly orthogonal quadrature. Another nonclassical state is the twin beams state, in which intensity difference fluctuations between them is less than that between two coherent beams. In addition, entanglement, i.e., nonlocal quantum correlation between two or more quantum mechanical objects, is the essential resource in present quantum information and communications technology. Furthermore, it has also been used to verify the foundations of the quantum theory. Thus, the development of techniques to generate these quantum states is of great importance in this field. Lots of efficient methods have been proposed to generate the non-classical state. Among them, two of the most successful systems for squeezed state generation have been the optical parametric oscillator (OPO) and optical parametric amplifier (OPA), both of which have the same underlying the second-order (χ (2) ) nonlinearity. With the χ (2) nonlinearity, the two-photon state from spontaneous parametric down-conversion (SPDC) has served as a test bed for verifying the foundations of the quantum theory, such as the Einstein, Podolsky and Rosen (EPR) paradox [3], and has been exploited as a powerful source for demonstrating quantum information experiments with discrete variable [4]. On the other hand, OPA/O has also developed into one of the most efficient tools to produce entangled states and squeezed state of light for quantum information systems with continuous variable (CV) from the first realization of squeezed state from an OPO at a couple of decades ago.The operation regime for the above device is one in which the OPO is pumped by a harmonic wave (frequency 2 ω ), whose power is close to the threshold power for the onset of parametric oscillation. The input subharmonic waves are usually either vacuum modes or very weak, so that in the amplification process no or very little power is transferred to them from the pump wave (no pump deletion). Basic optical processes of OPO involving the χ (2) nonlinearity are illustrated in Fig. 1. We

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“…They are defined as fully correlated and at once the eigenstates for the product of annihilation operators of the both modes. The latter condition makes them the special case of the wider class of the twomode correlated states, also referred to as twin beams, which are broadly investigated in the past time [10,11,12] and are usually obtained in the process of parametric down-conversion (PDC) in nonlinear crystals.…”

Section: Protocolmentioning

confidence: 99%

Large-alphabet quantum key distribution with two-mode coherently correlated beams

Usenko

Lev

2005

Physics Letters A

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Generation of twin beams from an optical parametric oscillator pumped by a frequency-doubled diode laser

Cited by 32 publications

References 16 publications

Quantum communication with photon-number entangled states and realistic photodetection

Quantum communication with photon-number entangled states and realistic photodetection

Generation of non-classical states from an optical parametric oscillator/amplifier and their applications

Large-alphabet quantum key distribution with two-mode coherently correlated beams

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