Quantum interference of ultrastable twin optical beams

Abstract

We report the first measurement of the quantum phase-difference noise of an ultrastable nondegenerate optical parametric oscillator that emits twin beams classically phase-locked at exact frequency degeneracy. The measurement illustrates the property of a lossless balanced beam-splitter to convert number-difference squeezing into phase-difference squeezing and, thus, provides indirect evidence for Heisenberg-limited interferometry using twin beams. This experiment is a generalization of the Hong-Ou-Mandel interference effect for continuous variables and constitutes a milestone towards continuous-variable entanglement of bright, ultrastable nondegenerate beams.

4 pages, 4 figs, accepted by Phys. Rev. Lett

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• Conversion of conventional gravitational-wave interferometers into QND interferometers by modifying their input and/or output optics
• Generation of Continuous Variable Einstein-Podolsky-Rosen Entanglement via the Kerr Nonlinearity in an Optical Fibre
• Stable nondegenerate optical parametric oscillation at degenerate frequencies in Na:KTP
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• Phase Sensitivity of a Mach-Zehnder Interferometer
• Entangling the optical frequency comb: simultaneous generation of multiple 2x2 and 2x3 continuous-variable cluster states in a single optical parametric oscillator
• Non-Linear Beam Splitter in Bose-Einstein Condensate Interferometers
• State-independent quantum tomography of a single-photon state by photon-number-resolving measurements
• Conditional transfer of quantum correlation in the intensity of twin beams
• Continuous-wave phase-sensitive parametric image amplification
• Sub-shot-noise heterodyne polarimetry
• Quadrature entanglement and photon-number correlations accompanied by phase-locking
• Nonlocal restoration of two-mode squeezing in the presence of strong optical loss
• Phase-locking at low-level of quanta
• A graphical description of optical parametric generation of squeezed states of light
• Generating green to red light with semiconductor lasers