Observation of Quantum Noise Reduction on Twin Laser Beams

Heidmann, A.; Horowicz, R. J.; Reynaud, Serge; Giacobino, E.; Fabre, Claude; Camy, G.

doi:10.1103/physrevlett.59.2555

Cited by 633 publications

(372 citation statements)

References 23 publications

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“…The novelty is related to the presence of additional idlers and multimode squeezing [21] and large phase fluctuations resulting from a continuous degeneracy of the oscillator state. The latter is analogous to an extensively studied effect in optical parametric oscillators [25][26][27][28][29][30][31][32][33]. Similar parametric oscillations were recently observed and investigated in a mechanical resonator [34].…”

Section: Introductionmentioning

confidence: 71%

Nondegenerate parametric oscillations in a tunable superconducting resonator

et al. 2018

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We investigate nondegenerate parametric oscillations in a superconducting microwave multimode resonator that is terminated by a superconducting quantum interference device (SQUID). The parametric effect is achieved by modulating magnetic flux through the SQUID at a frequency close to the sum of two resonator-mode frequencies. For modulation amplitudes exceeding an instability threshold, self-sustained oscillations are observed in both modes. The amplitudes of these oscillations show good quantitative agreement with a theoretical model. The oscillation phases are found to be correlated and exhibit strong fluctuations which broaden the oscillation spectral linewidths. These linewidths are significantly reduced by applying a weak on-resonant tone, which also suppresses the phase fluctuations. When the weak tone is detuned, we observe synchronization of the oscillation frequency with the frequency of the input. For the detuned input, we also observe an emergence of three idlers in the output. This observation is in agreement with theory indicating four-mode amplification and squeezing of a coherent input.

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Section: Introductionmentioning

confidence: 71%

Nondegenerate parametric oscillations in a tunable superconducting resonator

et al. 2018

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“…So far twin-beams have been obtained in the macroscopic regime from parametric oscillators [1,2,3] or from seeded parametric amplifiers [4,5] and, with much lower photon numbers, from traveling-wave optical parametric amplifiers (OPA) [6,7]. Quantum correlations between light beams play a crucial role in fundamental quantum optics [8] and find applications in quantum cryptography [9] and communication [10,11], spectroscopy [1], interferometry [12], as well as in enhancing sensitivity in imaging [13] and high-precision measurements [14].…”

Section: Introductionmentioning

confidence: 99%

Sub-shot-noise photon-number correlation in a mesoscopic twin beam of light

Bondani¹,

et al. 2007

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We demonstrate sub-shot-noise photon-number correlations in a (temporal) multimode mesoscopic (∼ 10 3 detected photons) twin-beam produced by ps-pulsed spontaneous non-degenerate parametric downconversion. We have separately detected the signal and idler distributions of photons collected in twin coherence areas and found that the variance of the photon-count difference goes below the shot-noise limit by 3.25 dB. The number of temporal modes contained in the twin-beam, as well as the size of the twin coherence areas, depends on the pump intensity. Our scheme is based on spontaneous downconversion and thus does not suffer from limitations due to the finite gain of the parametric process. Twin-beams are also used to demonstrate the conditional preparation of a nonclassical (sub-Poissonian) state.

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“…In recent years, attention has also been brought to the problem of the manipulation of cold atomic samples with non-classical fields in order to produce non-classical matter waves [2,3,4]. In this case, the slow atomic dynamics also requires squeezing at low frequencies.The standard technique for generating nonclassical light fields is by parametric down-conversion in a crystal, with an optical parametric oscillator or an optical parametric amplifier [5,6]. While very large amounts of quantum noise reduction have been achieved in this way [7,8], controlling the frequency and the linewidth of the light remains a challenge.…”

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confidence: 99%

Strong low-frequency quantum correlations from a four-wave-mixing amplifier

et al. 2008

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We show that a simple scheme based on nondegenerate four-wave mixing in a hot atomic vapor behaves like a near-perfect phase-insensitive optical amplifier, which can generate bright twin beams with a measured quantum noise reduction in the intensity difference of more than 8 dB, close to the best optical parametric amplifiers and oscillators. The absence of a cavity makes the system immune to external perturbations, and the strong quantum noise reduction is observed over a large frequency range.PACS numbers: 42.50. Gy, 42.50.Dv Two-mode squeezed beams have become a valuable source of entanglement for quantum communications and quantum information processing [1]. These applications bring specifi requirements on the squeezed light sources. For instance, for squeeze light to be used as a quantum information carrier interacting with material system, as in an atomic quantum memory, the light field must be resonant with an atomic transition and spectrally narrow to ensure an efficient coupling between light and matter. In recent years, attention has also been brought to the problem of the manipulation of cold atomic samples with non-classical fields in order to produce non-classical matter waves [2,3,4]. In this case, the slow atomic dynamics also requires squeezing at low frequencies.The standard technique for generating nonclassical light fields is by parametric down-conversion in a crystal, with an optical parametric oscillator or an optical parametric amplifier [5,6]. While very large amounts of quantum noise reduction have been achieved in this way [7,8], controlling the frequency and the linewidth of the light remains a challenge. Only recently have sources based on periodically-poled nonlinear crystals been developed at 795 nm to couple to the Rb D1 atomic line [9,10]. On the other hand, stimulated four-wave mixing (4WM) naturally generates narrow-band light close to an atomic resonance, but its development as an efficient source of squeezed light has been hindered by fundamental limitations such as spontaneous emission. At the end of the 1990s, nondegenerate 4WM in a double-lambda scheme was identified as a possible workaround for these limitations, as described in Ref.[11] and references therein. It was not until recently that such a scheme was implemented in continuous mode in an efficient way in both the low [12,13,14] and the high [15,16] intensity regimes, where it was shown to generate twin beams where quantum correlations are not masked by competing effects.The double-lambda scheme gives rise to complex atomic dynamics and propagation properties, such as slow-light effects [17]. In this Letter, we show that in spite of this complexity, the quantum properties of the scheme can be accurately described as the combination of a perfect amplifier and a partial absorber. This model allows us to optimize the quantum noise reduction in the intensity difference of the bright twin beams and to isolate the limiting factors of this reduction. It also helps to identify regions of the parameter space where the syst...

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Observation of Quantum Noise Reduction on Twin Laser Beams

Cited by 633 publications

References 23 publications

Nondegenerate parametric oscillations in a tunable superconducting resonator

Nondegenerate parametric oscillations in a tunable superconducting resonator

Sub-shot-noise photon-number correlation in a mesoscopic twin beam of light

Strong low-frequency quantum correlations from a four-wave-mixing amplifier

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