Pulsed homodyne measurements of femtosecond squeezed pulses generated by single-pass parametric deamplification

Abstract

A new scheme is described for pulsed squeezed light generation using femtosecond pulses parametrically deamplified through a single pass in a thin (0.1mm) potassium niobate KNbO3 crystal, with a significant deamplification of about -3dB. The quantum noise of each individual pulse is registered in the time domain using a single-shot homodyne detection operated with femtosecond pulses and the best squeezed quadrature variance was measured to be 1.87 dB below the shot noise level. Such a scheme provides the basic ressource for time-resolved quantum communication protocols.

arXiv commentAccepted for publication in Optics Letters

References in corpus (3)

• Quantum key distribution using gaussian-modulated coherent states
• An ultra-sensitive pulsed balanced homodyne detector: Application to time-domain quantum measurements
• Two-photon absorption in potassium niobate

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