Single-beam noise characteristics of quantum-correlated twin beams

Zhang, Yun; Kasai, Katsuyuki; Hayasaka, Kazuhiro

doi:10.1364/josab.21.001044

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…The pump power of the OPOs was adjusted so that the two output twin beams were of equal intensity. The configuration and operating principles of the NOPOs have been described in detail previously [6,19]. Both produce twin beams of 7.0 dB of intensity difference squeezing at 3.5 MHz as photocurrent difference measured using a spectrum analyzer.…”

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confidence: 99%

Conditional transfer of quantum correlation in the intensity of twin beams

2005

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A conditional protocol of transferring quantum-correlation in continuous variable regime was experimentally demonstrated. The quantum-correlation in two pairs of twin beams, each characterized by intensity-difference squeezing of 7.0 ± 0.3 dB, was transferred to two initially independent idler beams. The quantum-correlation transfer resulted in intensity-difference squeezing of 4.0 ± 0.2 dB between two idler beams. The dependence of preparation probability and transfer fidellity on the selection bandwidth was also studied.PACS numbers: 42.50. Dv, 03.67.Dd, 03.67.Hk The ability to transfer quantum properties from one system to another is a prerequisite for quantum communications. A well-known example is the quantum state transfer between atoms and photons. Unitary interactions between atoms and photons, such as strongcoupling cavity QED [1] and electromagnetically induced transparency [2], have been employed to transfer an initial quantum state from one subsystem to another subsystem. Quantum frequency conversion is another example, in which the quantum properties of an optical wavelegth is transferred to another [3]. More popular example is the quantum teleportation [4]. The initial unknown state of a quantum system can be transferred to another with the assistance of the entanglement. All of these protocols are unconditional and demand a lot of effort for experimental realization. Here we demonstrate a simpler protocol, in which quantum correlation of twin beams is conditionally transferred from the one pair to another pair by postselection.Differing from squeezed states on quadrature amplitudes, the intensity difference noise between signal and idler beams of twin beams is below the shot noise limit, therefore only the field intensities need to be measured rather than the quadrature amplitudes. Since the first experimental demonstration of twin beams, their generation and application have been studied extensively [5]. Recent investigations have focused on the characterizing twin beams in the time domain [6] and conditional preparation of a sub-Poissonian state based on post selection of twin beams [7]. A more exciting achievement is that ultra-stable twin beams have been produced at a precise frequency degeneracy from a nondegenerate optical parametric oscillator (NOPO) operating above its threshold through the use of a new nonlinear crystal and an active phase-lock system [8]. The entanglement state can also be generated by using a self-phase-locked OPO [9]. These reports indicate that the quantum correlation between the two beams of twin beams can be as a testbed for verifying the foundations of the quantum theory in quantum optics and quantum information fields.Conditional state preparation, or post selection, was originally proposed for use in a discrete-variable system. It was widely and successfully used to prepare a single photon state from quantum-correlated photons ("twin photons") generated via parametric down conversion [10]. Quantum correlation between two photons -a signal and a trigger -is the...

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Conditional transfer of quantum correlation in the intensity of twin beams

2005

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“…The detail of indication of squeezing of the single-beam is reported in Ref. [83]. Here we give the relaxation oscillation of our triply resonant NDOPO.…”

Section: Relaxation Oscillation Of Opomentioning

confidence: 73%

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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“…It had been known that far above the pump threshold, in addition to the quantum correlations in intensity of the twin beams, each signal and idler beam is also amplitude squeezed [343,510,515]. However this phenomenon eluded a direct observation with conventional OPOs because the combination of the required high pump power and accessible linewidths caused relaxation oscillations [516][517][518] hiding the effect. The OPO inside the WGMR made it possible to measure this behavior directly [108].…”

Section: Second-order Processes Above Threshold: Squeezingmentioning

confidence: 99%

Nonlinear and quantum optics with whispering gallery resonators

Strekalov

Marquardt

Matsko

et al. 2016

J. Opt.

267

120

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Optical whispering gallery modes (WGMs) derive their name from a famous acoustic phenomenon of guiding a wave by a curved boundary observed nearly a century ago. This phenomenon has a rather general nature, equally applicable to sound and all other waves. It enables resonators of unique properties attractive both in science and engineering. Very high quality factors of optical WGM resonators persisting in a wide wavelength range spanning from radio frequencies to ultraviolet light, their small mode volume, and tunable in-and out-coupling make them exceptionally efficient for nonlinear optical applications. Nonlinear optics facilitates interaction of photons with each other and with other physical systems, and is of prime importance in quantum optics. In this paper we review numerous applications of WGM resonators in nonlinear and quantum optics. We outline the current areas of interest, summarize progress, highlight difficulties, and discuss possible future development trends in these areas.

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Single-beam noise characteristics of quantum-correlated twin beams

Cited by 11 publications

References 19 publications

Conditional transfer of quantum correlation in the intensity of twin beams

Conditional transfer of quantum correlation in the intensity of twin beams

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

Nonlinear and quantum optics with whispering gallery resonators

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