Rafi Vered

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

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.

Ultra-broadband homodyne-detection for parallel processing of quantum-information

Quantum-optical states, such as single-photons or quadrature-squeezed light, used for processing quantum-information easily reach optical bandwidths, however homodyne-detection — a major quantum-information tool, is sub-GHz limited. Using optical parametric-amplification we demonstrate effectively bandwidth unlimited optical-homodyne measurement.

Quantum Effects in Four-Wave Mixing: Collapse and Revival of Bi-Photon Interference

We explore the classical-to-quantum transition with light produced by broadband spontaneous FWM in fibers. Observing bi-photon quantum interference and its dependence on internal loss, we demonstrate quantum collapse and revival of the interference contrast.

Exploring ultra broadband bi-photons produced by four wave mixing: from classical to quantum

We demonstrate two-photon interference with bi-photons produced by FWM. We explore the quantum / classical nature of the light by observing the loss dependence of the interference contrast at various intensities across the quantum-to-classical transition.

Observing the Transition from Classical to Quantum Photon Correlation in Four Wave Mixing

We demonstrate two-photon interference with bi-photons produced by FWM. We explore the quantum / classical nature of the light by observing the loss dependence of the interference contrast at various intensities across the quantum-to-classical transition.