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The squeezing properties of optical field and atomic laser are studied in the system of two-mode SU (1, 1) coherent states interacting with two-level atomic BEC. The results show that two quadrature components of optical field can be squeezed periodically. The frequency of squeezing of optical field depends closely on both the interaction among atoms in BEC and the coupling constant between optical...
The quantization of the light field is important for understanding some aspects of optical fiber systems: the quantum limit of amplifiers, the dynamics of solitons below shot noise and the appearance of non-classical light.
We investigate propagation of squeezed light in array of coupled waveguides which has tremendous potential for applications in engineering. We take a look at the possibility of Talbot effect with squeezed states of light. We also demonstrate how Hong-Ou-Mandel effect may be engineered to be relatively immune to fabrication imperfections.
Squeezed states of light possess an asymmetric noise distribution whereby the uncertainty in one quadrature is less than the standard quantum noise limit. These states can be generated through a nonlinear optical process in an optical parametric oscillator (OPO). In this paper, we model such an optical squeezer and design an LQG controller which includes integral action to optimize the level of squeezing...
We fabricated the highly birefringent photonic crystal fiber with squeezed lattice. The polarization dependent loss (PDL), differential group delay (DGD) and modal birefringence of fabricated fiber at 1550nm were measured to be 0.11dB, 2.18ps and 2.29×10-4, respectively.
We demonstrate spin squeezing of a magnetically sensitive coherent spin-state in an ensemble of ~ 6.5 × 105 cold 87Rb atoms. Quantum non-demolition measurements achieved a spin-noise reduction by 2.9(+1.3-1.0) dB compared to the initial projection noise level.
The sensitivity of laser-interferometric gravitational wave detectors can be improved with squeezed light. The first squeezed-light laser aiming for a permanent operation in such a detector has now been accomplished and characterized.
In this paper, we consider the application of linear quadratic Gaussian (LQG) control to the problem of optimizing the level of squeezing in one of the quadratures of an optical field. Squeezed states of light can be generated when two optical fields (at fundamental and second-harmonic frequencies) interact in an optical cavity in the presence of a second-order nonlinear crystal. Our system is an...
We demonstrate the measurement of a “squeezing comb”, the time-resolved homodyne detection of the first twelve vacuum squeezing sidebands of an optical parametric oscillator, and propose its use as a multiplexed quantum communications channel.
We demonstrate an averaging process, corresponding to the harmonic-mean, that average quantum noise sources better than the basic arithmetic-mean strategy. Using simple linear optics, homodyne detection and feedforward, and it is tested on squeezed states.
Homodyne locking is a new approach to frequency-locking an OPO-based squeezed-vacuum source and its driving laser. It is cheap, easy to implement, subsequent measurements are automatically phase-locked, and it is uniquely a sub-QNL frequency discriminator.
The squeezing of the atom in nonlinear interaction of a two-level atom with a single-mode field is investigated. The results show the nonlinearity plays an important role in entropy and variance squeezing of the atom.
A novel post-selection scheme is proposed to generate squeezed vacuum pulses using noisy fiber laser pulses at 1550 nm. By selecting only coherent pulses with low excess noise, quadrature squeezing is obtainable with conditional homodyne detection.
Short length optical fibers are proved to be effective to reduce Brillouin scattering noise and produce squeezed vacuum even at low repetition pulse rates. Noise reduction of 2.4 dB below the shot noise level is observed.
Squeezed vacuum up to -1.7 dB is generated with chi(3) nonlinearity caused by cascaded chi(2) nonlinearity in a quasi-phase-matched (QPM) PPLN crystal placed in a Sagnac interferometer with 1550 nm femtosecond laser pulses.
This talk will give an overview of quantum imaging, a new branch of the modern quantum optics which has been very rapidly developing during the last few years. Several directions in quantum Imaging will be discussed, such as generation of multimode squeezed states, noiseless image amplification, quantum super-resolution, etc.
We present the quadrature and polarization squeezing generated by a sub-threshold optical parametric oscillator (OPO) resonant to rubidium D1 line and pumped by a frequency-doubled diode laser. We demonstrate here a technique to eliminate the effects of laser phase noise on quadrature squeezing. The technique uses cavity stabilization of the laser frequency, in combination with a carefully chosen...
In this contribution we present an experiment demonstrating the generation of non-classical SPPs by exciting them with a squeezed optical light field generated using a bow-tie shaped optical parametric oscillator operating below threshold. Free space optics and end-fire coupling are used for the excitation of long-range SPPs (LR-SPPs) on gold stripes embedded in lossless transparent polymer BCB.
Recent experiments with optical parametric oscillators have shown that an unpredicted extra noise on the phase of the fields reduces the level of squeezing or quantum correlations. In some cases, it can hinder the attempts to observe entanglement in those systems. It is probably the main reason why signal and idler entanglement above threshold remained unobserved by almost 20 years after its prediction...
This communication studies the phenomenon of quadrature squeezing generated via spontaneous rotational symmetry breaking. A degenerate optical parametric oscillator (DOPO) tuned to the first family of transverse modes at the signal frequency, and having perfectly spherical mirrors. When pumped above threshold with a Gaussian beam and within a classical description, it is easy to show that a TEM10...
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