Sub-shot-noise heterodyne polarimetry

Abstract

We report the experimental demonstration of a heterodyne polarization rotation measurement with a noise floor 4.8 dB below the optical shot noise, by use of the classically phase-locked quantum twin beams emitted above threshold by an ultrastable type-II Na:KTP CW optical parametric oscillator. We believe this is the largest noise reduction achieved to date on optical phase-difference measurements.

3 pages, 2 figs, some clarifications and one reference added

References in corpus (4)

• Generation of Continuous Variable Einstein-Podolsky-Rosen Entanglement via the Kerr Nonlinearity in an Optical Fibre
• Conditional preparation of a quantum state in the continuous variable regime: generation of a sub-Poissonian state from twin beams
• Quantum interference of ultrastable twin optical beams
• Stable nondegenerate optical parametric oscillation at degenerate frequencies in Na:KTP

Cited by in corpus (6)

• Multiphoton path entanglement by non-local bunching
• Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator
• Overcoming detection loss and noise in squeezing-based optical sensing
• Quantum-enhanced tomography of unitary processes
• Fundamental quantum limits in ellipsometry
• Enhanced optical communication and broadband sub-shot-noise interferometry with a stable free-running periodically-poled-KTiOPO4 squeezer