An ultra-sensitive pulsed balanced homodyne detector: Application to time-domain quantum measurements

Details An ultra-sensitive pulsed balanced homodyne detector: Application to time-domain quantum measurements An ultra-sensitive pulsed balanced homodyne detector: Application to time-domain quantum measurements

2001-04-18

arxiv.org/abs/quant-ph/0104084v1

Optics Letters 26, 1430 (2001)

Physics

Quantum Physics

3 pages, submitted to Optics Letters

Scientific paper

10.1364/OL.26.001714

A pulsed balanced homodyne detector has been developed for precise measurements of 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 the measurement of the quantum noise of individual pulses. Measurements at repetition rates up to 1 MHz are possible. As a test, quantum tomography of the coherent state is performed and the Wigner function and the density matrix are reconstructed with a 99.5% fidelity. The detection system can also be used for ultrasensitive balanced detection in cw mode, e.g. for weak absorption measurements.

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