Volume 64, Number 1, October 2003
|Page(s)||15 - 21|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 November 2003|
Generation of frequency-tunable twin beams and its application in sub–shot-noise FM spectroscopy
State Key Laboratory of Quantum Optics and Quantum
Optics Devices Institute of Opto-electronics, Shanxi University -
Taiyuan, Shanxi, 030006, PRC
Corresponding author: email@example.com
Accepted: 23 July 2003
Widely frequency-tunable quantum-correlated twin beams have been experimentally demonstrated. The noise of the intensity difference between the signal and idler beams of the twin beams is reduced to more than 3 below the shot noise limit (SNL) throughout a wavelength-tuning range of 5.6. A continuously frequency-tuning range of 2.8 appears around the center wavelength of 1041.506 nm, where the maximum noise reduction of about 5.3 dB is observed. The tunable twin beams are used in frequency modulation (FM) spectroscopy of molecules and a spectrum with a sensitivity of about 4 beyond that of the SNL is obtained.
PACS: 42.50.Dv – Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements / 03.65.Ta – Foundations of quantum mechanics; measurement theory / 42.65.Lm – Parametric down conversion and production of entangled photons
© EDP Sciences, 2003
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