A new scheme is described for the generation of pulsed squeezed light by use of femtosecond pulses that have been parametrically deamplified through a single pass in a thin (100-µm) potassium niobate crystal with a significant deamplification of ~- 3dB . The quantum noise of each pulse is registered in the time domain by single-shot homodyne detection operated with femtosecond pulses; the best squeezed quadrature variance was 1.87 dB below the shot-noise level. Such a scheme provides a basic resource for time-resolved quantum communication protocols.
© 2004 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(270.5570) Quantum optics : Quantum detectors
(270.6570) Quantum optics : Squeezed states
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
Jérôme Wenger, Rosa Tualle-Brouri, and Philippe Grangier, "Pulsed homodyne measurements of femtosecond squeezed pulses generated by single-pass parametric deamplification," Opt. Lett. 29, 1267-1269 (2004)