Observation of sub-Poissonian light in traveling-wave second-harmonic generation

Youn, Sung Won; Choi, Sang Kyung; Kumar, Prem; Li, Ruo Ding

doi:10.1364/ol.21.001597

Cited by 21 publications

(12 citation statements)

References 11 publications

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“…Thus, the SH field from a coherent pump field is endowed with quantum correlations, which is due to the anti-bunching resulting from an up-conversion with efficiency proportional to N j (Equation (36)). It is a well-known result [8,9], which has been also experimentally tested [18,19]. We here point out that, as expected, the annihilation processes and the interference between different processes contribute to reducing quantum correlations and, consequently, the nonclassicality of the output state, as shown in Figure 2.…”

Section: Coherent Statesupporting

confidence: 80%

Second Harmonic Revisited: An Analytic Quantum Approach

et al. 2019

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We address the second-harmonic generation process in a quantum frame. Starting with a perturbative approach, we show that it is possible to achieve a number of analytic results, ranging from the up-conversion probability to the statistical properties of the generated light. In particular, the moments and the correlations of the photon-number distribution of the second-harmonic light generated by any initial state are retrieved. When possible, a comparison with the results achieved with the classical regime is successfully provided. The nonclassicality of some benchmark states is investigated by inspecting the corresponding autocorrelation function.

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Section: Coherent Statesupporting

confidence: 80%

Second Harmonic Revisited: An Analytic Quantum Approach

et al. 2019

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“…1, versus g. The solid curve corresponds to S 1 versus g, calculated according to Eq. (3). Note that the solid curve depends on the pulse shape but not on the pulse width.…”

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confidence: 99%

“…1 Squeezing by means of SHG, however, was limited to resonant-cavity configurations only. 2 Although evidence of squeezing at the fundamental frequency was recently observed in type II TW SHG, 3 no squeezing has yet been obtained by the conceptually simpler method of type I TW SHG, which was proposed 15 years ago. 4 The basic obstacle stems from the fact that, in bulk nonlinear crystals, hundreds of watts of peak power are typically required for significant harmonic conversion, and hence squeezing.…”

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confidence: 99%

Amplitude squeezing by means of quasi-phase-matched second-harmonic generation in a lithium niobate waveguide

et al. 1997

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We demonstrate that traveling-wave second-harmonic generation produces amplitude-squeezed light at both the fundamental and the harmonic frequencies. Quasi-phase-matched second-harmonic conversion efficiencies approaching 60% were obtained in a 26-mm-long single-mode LiNbO(3) waveguide with pulses from a mode-locked laser at 1.53 microm. The amplitude noise of the transmitted fundamental field was measured to be 0.8 dB below the shot-noise level, and the generated 0.765-microm harmonic light was measured to be amplitude squeezed by 0.35 dB. The conversion-efficiency dependence of the observed squeezing at both wavelengths agrees with theoretical predictions. Waveguide losses appear to degrade the squeezing, but the maximum observed squeezing is currently limited only by the available input power.

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“…Therefore, we have that the beam b is also subPossonian for N < ∼ 2.2. The verification of nonclassicality can be performed, for any value of the gain, by checking the negativity of the Wigner function through quantum homodyne tomography [32], and in the low gain regime, also by verifying the subPoissonian character by measuring the Fano factor via direct noise detection [33,34].…”

Section: A Geigerlike (On/off) Photodetectionmentioning

confidence: 99%

Quantum-state engineering assisted by entanglement

2003

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We suggest a general scheme for quantum state engineering based on conditional measurements carried out on entangled twin-beam of radiation. Realistic detection schemes such as on/off photodetection, homodyne detection and joint measurement of two-mode quadratures are analyzed in details. Imperfections of the apparatuses, such as nonunit quantum efficiency and finite resolution, are taken into account. We show that conditional on/off photodetection provides a reliable scheme to verify nonclassicality, whereas conditional homodyning represents a tunable and robust source of squeezed light. We also describe optical teleportation as a conditional measurement, and evaluate the degrading effects of finite amount of entanglement, decoherence due to losses, and nonunit quantum efficiency.

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Observation of sub-Poissonian light in traveling-wave second-harmonic generation

Cited by 21 publications

References 11 publications

Second Harmonic Revisited: An Analytic Quantum Approach

Second Harmonic Revisited: An Analytic Quantum Approach

Amplitude squeezing by means of quasi-phase-matched second-harmonic generation in a lithium niobate waveguide

Quantum-state engineering assisted by entanglement

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