Fibre-optic photon-number squeezing in the normal group-velocity dispersion regime
F Konig,
S Spalter,
IL Shumay,
A Sizmann,
T Fauster,
Gerd Leuchs
JOURNAL OF MODERN OPTICS
45
(12)
2425-2431
(1998)
| Journal
The nonlinear optical Kerr effect, acting on optical pulses in fibres,<br> creates spectral sidebands and noise correlations between these<br> sidebands. The reduction of photon-number fluctuations of these pulses<br> below the shot-noise limit by spectral filtering is well established in<br> the anomalous dispersion regime which allows for soliton formation. Here<br> it is demonstrated that a significant quantum-noise reduction with<br> spectral filtering can also be reached for pulses in the normal<br> dispersion regime. The filter function was optimized and the power<br> dependence of the noise reduction was investigated. The best squeezing<br> result is (1.2 +/- 0.2) dB (corresponding to (2.6 +/- 0.7) dB inferred<br> for 100% detection efficiency).
Photon-number squeezed solitons from an asymmetric fiber-optic sagnac interferometer
S Schmitt,
J Ficker,
M Wolff,
F Konig,
A Sizmann,
Gerd Leuchs
Direct photon-number squeezing is demonstrated, for the first time to<br> our knowledge, in a nonlinear fiber-optic interferometer. Launching<br> 126-fs solitons into a highly asymmetric Sagnac loop, the maximum<br> photocurrent noise reduction was 3.9 +/- 0.2 dB below shot noise,<br> corresponding to 6.0 +/- 0.9 dB, when corrected for linear losses. The<br> loop is a model system for squeezing generated by the interference of<br> two pulses after nonlinear propagation through a fiber.
Noise-free quantum-nondemolition measurement using optical solitons
JM Courty,
S Spalter,
F Konig,
A Sizmann,
Gerd Leuchs
PHYSICAL REVIEW A
58
(2)
1501-1508
(1998)
| Journal
The collision of solitons in optical fibers is a promising scheme for<br> the quantum-nondemolition measurement of the photon number using the<br> cross Kerr effect. In a realistic experimental situation, the<br> sensitivity of the measurement is limited not only by<br> self-phase-modulation noise of the probe but also by the phase noise<br> added due to the vibrational excitations of the fiber. Former schemes<br> proposed to overcome either of these problems are not compatible with<br> each other. In this paper the sensitivity of different type of detection<br> is carefully studied. We propose a solution based on the use of a<br> phase-shifting cavity. We show that this provides a conceptually and<br> practically simple solution eliminating simultaneously both sources of<br> excess noise. [S1050-2947(98)04406-0].
Observation of multimode quantum correlations in fiber optical solitons
S Spalter,
N Korolkova,
F Konig,
A Sizmann,
Gerd Leuchs
Quantum correlations of photon numbers in different spectral components<br> of ultrashort optical solitons have been observed experimentally. These<br> correlations an crucial for the understanding and characterization of<br> the internal quantum structure of soliton pulses and contribute<br> significantly to soliton squeezing by spectral filtering. The accessible<br> information on the nonclassical state of the correlated spectral<br> components is discussed with the example of two modes. The method may be<br> generalized to obtain a complete quantum description of a multimode<br> field. [S0031-9007(98)06700-3].
Propagation of quantum properties of sub-picosecond solitons in a fiber
S Spalter,
M Burk,
U Strossner,
A Sizmann,
Gerd Leuchs
We present new results on photon number squeezing of spectrally filtered<br> solitons in fibers. The impact of frequency low-, high-, and bandpass<br> filtering on noise reduction has been measured as a function of fiber<br> length for 130-fs pulses close to the soliton energy. For short fibers<br> our results agree qualitatively with theoretical predictions. For longer<br> fibers, however, the measured squeezing increases to an unexpectedly<br> large value. Spectral filtering of a strongly Raman-shifted, higher<br> energy pulse squeezed the directly detected photocurrent fluctuations<br> down to 3.8+/-0.2 dB (59%) below the shot noise level. The measured<br> noise reductions are broadband from 5 to 90 MHz. (C) 1997 Optical<br> Society of America.
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