Quantum state reconstruction of spectral field modes: homodyne and resonator detection schemes

Abstract

We revisit the problem of quantum state reconstruction of light beams from the photocurrent quantum noise. As is well-known, but often overlooked, two longitudinal field modes contribute to each spectral component of the photocurrent (sideband modes). We show that spectral homodyne detection is intrinsically incapable of providing all the information needed for the full reconstruction of the two-mode spectral quantum state. Such a limitation is overcome by the technique of resonator detection. A detailed theoretical description and comparison of both methods is presented, as well as an experiment to measure the six-mode quantum state of pump-signal-idler beams of an optical parametric oscillator above the oscillation threshold.

16 pages, 10 figures

References in corpus (5)

• Experimental demonstration of three-color entanglement
• Direct Production of Tripartite Pump-Signal-Idler Entanglement in the Above-Threshold Optical Parametric Oscillator
• The conversion of phase to amplitude fluctuations of a light beam by an optical cavity
• Beyond spectral homodyne detection: complete quantum measurement of spectral modes of light
• Optical homodyne detection in view of joint probability distribution

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