Two-photon correlation of broadband-amplified spontaneous four-wave mixing

Vered, Rafi Z.; Rosenbluh, M.; Pe'er, Avi

doi:10.1103/physreva.86.043837

Cited by 9 publications

(9 citation statements)

References 25 publications

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“…By probing the Raman interaction in the sample with broadband two-mode squeezed light (see Fig. 1b), generated via FWM in the OPAs, 20 the resonant signal of the sample is enhanced by the squeezing ratio of the OPAs, while the non-resonant background is completely eliminated by destructive interference due to the inherent π/2 difference in the phase response between the resonant and non-resonant interactions. This configuration effectively forms a quantum-enhanced version of interferometric CARS.…”

Section: Introductionmentioning

confidence: 99%

Squeezing-enhanced Raman spectroscopy

et al. 2019

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The sensitivity of classical Raman spectroscopy methods, such as coherent anti-stokes Raman spectroscopy (CARS) or stimulated Raman spectroscopy (SRS), is ultimately limited by shot-noise from the stimulating fields. We present the complete theoretical analysis of a squeezing-enhanced version of Raman spectroscopy that overcomes the shot-noise limit of sensitivity with enhancement of the Raman signal and inherent background suppression, while remaining fully compatible with standard Raman spectroscopy methods. By incorporating the Raman sample between two phase-sensitive parametric amplifiers that squeeze the light along orthogonal quadrature axes, the typical intensity measurement of the Raman response is converted into a quantumlimited, super-sensitive estimation of phase. The resonant Raman response in the sample induces a phase shift to signal-idler frequency-pairs within the fingerprint spectrum of the molecule, resulting in amplification of the resonant Raman signal by the squeezing factor of the parametric amplifiers, whereas the non-resonant background is annihilated by destructive interference. Seeding the interferometer with classical coherent light stimulates the Raman signal further without increasing the background, effectively forming squeezing-enhanced versions of CARS and SRS, where the quantum enhancement is achieved on top of the classical stimulation.

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Section: Introductionmentioning

confidence: 99%

Squeezing-enhanced Raman spectroscopy

et al. 2019

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“…This also depends on the existence of a convenient optical material with GVD of the required sign. Group delay dispersion (GDD) designed dielectric coatings [22], can offer full compensation with proper design and realization, but are costly, not tunable and have a limited dynamic range for phase correction. A spatial light modulators (SLM) [17,18] is a most general tunable compensation mechanism, although it is lossy and costly with limited spatial resolution and dynamic range.…”

Section: Introductionmentioning

confidence: 99%

Octave-spanning spectral phase control for single-cycle bi-photons

et al. 2015

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The quantum correlation of octave-spanning time-energy entangled bi-photons can be as short as a single optical cycle. Many experiments designed to explore and exploit this correlation require a uniform spectral phase (transform-limited) with very low loss. So far, transform-limited single-cycle bi-photons have not been demonstrated, primarily due to the lack of precise, broadband control of their spectral phase. Here, we demonstrate the correction of the spectral-phase of near-octave spanning bi-photons to 20 φ π < over an octave in frequency 1330 ≈ -2600 nm). Using a prism-pair with an effectively negative separation for shaping the bi-photons' spectral phase, we obtain a tuned, very low-loss compensation of both the second and fourth dispersion orders. An essential requisite for precise tuning over such a broad bandwidth is a measure of the spectral phase that provides feedback for the tuning even when the overall dispersion is far from compensated. This is achieved by a nonclassical bi-photon interference, which enables direct verification of the corrected bi-photon spectral phase.

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“…Specifically, it is important to observe how, and under what conditions broadband, classical phase-locking emerges from single photon quantum correlation [15][16][17][18][19][20]. Intuitively, the crossover between quantum and classical behavior occurs when the average photon flux exceeds one photon-pair per correlation-time of the bi-photons [26,36] (∼ 25fs in our FWM experiment [14]). When the bi-photon flux is lower than this limit, the FWM process is primarily spontaneous and its properties are only predicted by quantum mechanics, whereas for higher flux, stimulated FWM becomes pronounced and the quantum predictions converge to the classical analysis.Experimentally, this intermediate regime is unexplored due to the lack of adequate detection methods.…”

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confidence: 95%

“…The broadband signal-idler fields far from the pump frequency are generated purely by spontaneous FWM, similar to amplified spontaneous emission (ASE) in a laser amplifier. The peak power of the pump pulses provides a large parametric gain, capable of generating in a single pass through the unseeded fiber intense FWM sidebands with many mW of average power [14].…”

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confidence: 99%

“…It is important now to consider the gain properties of FWM in more detail. The phase mismatch ∆q depends not only on the dispersion properties of the medium, but also on the pump intensity via XPM, such that ∆q = ∆k+2γI p , where ∆k is the 'bare' phase mismatch of the fiber due to dispersion, I p is the pump intensity and γ is the nonlinear Kerr coefficient [14,34]. Consequently, the FWM gain is…”

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Classical-to-Quantum Transition with Broadband Four-Wave Mixing

Vered

Shaked²,

Ben-Or³

et al. 2015

Phys. Rev. Lett.

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A key question of quantum optics is how nonclassical biphoton correlations at low power evolve into classical coherence at high power. Direct observation of the crossover from quantum to classical behavior is desirable, but difficult due to the lack of adequate experimental techniques that cover the ultrawide dynamic range in photon flux from the single photon regime to the classical level. We investigate biphoton correlations within the spectrum of light generated by broadband four-wave mixing over a large dynamic range of ∼80 dB in photon flux across the classical-to-quantum transition using a two-photon interference effect that distinguishes between classical and quantum behavior. We explore the quantum-classical nature of the light by observing the interference contrast dependence on internal loss and demonstrate quantum collapse and revival of the interference when the four-wave mixing gain in the fiber becomes imaginary.

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Two-photon correlation of broadband-amplified spontaneous four-wave mixing

Cited by 9 publications

References 25 publications

Squeezing-enhanced Raman spectroscopy

Squeezing-enhanced Raman spectroscopy

Octave-spanning spectral phase control for single-cycle bi-photons

Classical-to-Quantum Transition with Broadband Four-Wave Mixing

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