Optical mode characterization of single photons prepared by means of conditional measurements on a biphoton state
The European Physical Journal D Springer Nature 18:2 (2002) 237-245
Nonclassical character of statistical mixtures of the single-photon and vacuum optical states
Physical Review A - Atomic, Molecular, and Optical Physics 65:3 (2002) 1-6
Abstract:
The electric-field-quadrature statistics of the ensembles of the vacuum state 0> are nonclassical according to the Vogel criterion. These states were synthesized and measured with an improved pair-production rate achieved by the pulse picking method. The Vogel criterion is generalized to apply to quadrature distributions obtained in interferometrically unstable settings. In addition, a quantitative analysis of statistical errors is given.Quantum-optical catalysis by means of a single photon
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series 74 (2002)
Abstract:
We convert coherent states of light into nonclassical coherent superpositions of the vacuum and the single-photon states via conditional measurements on a beamsplitter, employing single photons as "catalysts": they facilitate the conversion without being consumed.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.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