Ultrasensitive pulsed, balanced homodyne detector: application to time-domain quantum measurements.
Optics letters 26:21 (2001) 1714-1716
Abstract:
A pulsed, balanced homodyne detector has been developed for precise measurement of the electric field quadratures of pulsed optical quantum states. A high level of common mode suppression (>85 dB) and low electronic noise (730 electrons per pulse) provide a signal-to-noise ratio of 14 dB for measurement of the quantum noise of individual pulses. Measurements at repetition rates as high as 1 MHz are possible. As a test, quantum tomography of the coherent state was performed, and the Wigner function and the density matrix were reconstructed with 99.5% fidelity. The detection system can be used for ultrarsensitive balanced detection in cw mode, e.g., for weak absorption measurements.Nonclassical character of statistical mixtures of the single-photon and vacuum optical states
(2001)
Nonlinear Optical Studies of Surface Structures of Rubbed Polyimides and Adsorbed Liquid Crystal Monolayers
Molecular Crystals and Liquid Crystals Science and Technology Section A Molecular Crystals and Liquid Crystals Taylor & Francis 364:1 (2001) 427-434
Quantum state reconstruction of the single-photon Fock state
Physical Review Letters 87:5 (2001)
Abstract:
The phase-averaged Wigner function and the density matrix diagonal elements of an optical single-photon Fock state |1> were reconstructed using the method of phase-randomized pulsed optical homodyne tomography. A total measurement efficiency of 55.3 ± 1.3% was obtained. The measurement technique and error analysis were checked by performing a simultaneous measurement on the vacuum state.Optical mode characterization of single photons prepared via conditional measurements on a biphoton state
(2001)