scholarly journals Multimode optomechanical system in the quantum regime

2016 ◽  
Vol 114 (1) ◽  
pp. 62-66 ◽  
Author(s):  
William Hvidtfelt Padkær Nielsen ◽  
Yeghishe Tsaturyan ◽  
Christoffer Bo Møller ◽  
Eugene S. Polzik ◽  
Albert Schliesser
Keyword(s):  
Degrees Of Freedom ◽  
Noise Suppression ◽  
Quantum Noise ◽  
Quantum Correlations ◽  
Optical Mode ◽  
Optomechanical System ◽  
Quantum Regime ◽  
Fabry Perot ◽  
Measurement Rate ◽  
Resonator Modes

We realize a simple and robust optomechanical system with a multitude of long-lived (Q > 107) mechanical modes in a phononic-bandgap shielded membrane resonator. An optical mode of a compact Fabry–Perot resonator detects these modes’ motion with a measurement rate (96 kHz) that exceeds the mechanical decoherence rates already at moderate cryogenic temperatures (10 K). Reaching this quantum regime entails, inter alia, quantum measurement backaction exceeding thermal forces and thus strong optomechanical quantum correlations. In particular, we observe ponderomotive squeezing of the output light mediated by a multitude of mechanical resonator modes, with quantum noise suppression up to −2.4 dB (−3.6 dB if corrected for detection losses) and bandwidths ≲90 kHz. The multimode nature of the membrane and Fabry–Perot resonators will allow multimode entanglement involving electromagnetic, mechanical, and spin degrees of freedom.

Controlling nonclassical properties of optomechanical systems under the Coulomb interaction effect

2020 ◽  
Vol 18 (08) ◽  
pp. 2150002
Author(s):  
Abderrahim Lakhfif ◽  
Jamal El Qars ◽  
Mostafa Nassik
Keyword(s):  
Coulomb Interaction ◽  
Quantum Coherence ◽  
Quantum Correlations ◽  
Optomechanical System ◽  
Squeezed Light ◽  
Rotating Wave Approximation ◽  
Nonclassical Properties ◽  
Fabry Perot ◽  
Rotating Wave ◽  
Coulomb Effects

In an optomechanical system consisting of two Fabry–Pérot cavities fed by squeezed light and coupled via Coulomb interaction, we respectively use the logarithmic negativity, Gaussian discord and Gaussian coherence to analyze the behavior of three different indicators of nonclassicality, namely the entanglement, quantum discord and quantum coherence. We perform the rotating wave approximation and work in the resolved sideband regime. In two bi-mode states (optical and mechanical), the coherence is generally found to be greater than entanglement and discord. More interestingly, we show that the Coulomb interaction can be used either to degrade or enhance the nonclassical properties of the optical subsystem. In addition, compared with the discord and coherence, the mechanical entanglement is found strongly sensitive to both thermal and Coulomb effects, and it requires a minimum value of cooperativity to be generated. Remarkably, this minimum increases when increasing the Coulomb coupling strength. Finally, we notice that an optimal transfer of quantum correlations between the optical and mechanical subsystems is achieved in the absence of the Coulomb interaction.

scholarly journals Spin-Mechanics with Nitrogen-Vacancy Centers and Trapped Particles

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 651
Author(s):  
Maxime Perdriat ◽  
Clément Pellet-Mary ◽  
Paul Huillery ◽  
Loïc Rondin ◽  
Gabriel Hétet
Keyword(s):  
Degrees Of Freedom ◽  
Theoretical Background ◽  
Nitrogen Vacancy ◽  
Full Potential ◽  
Strongly Coupled ◽  
Trapped Particles ◽  
Quantum Regime ◽  
Atomic Spins ◽  
Nitrogen Vacancy Centers ◽  
Mechanical Oscillators

Controlling the motion of macroscopic oscillators in the quantum regime has been the subject of intense research in recent decades. In this direction, opto-mechanical systems, where the motion of micro-objects is strongly coupled with laser light radiation pressure, have had tremendous success. In particular, the motion of levitating objects can be manipulated at the quantum level thanks to their very high isolation from the environment under ultra-low vacuum conditions. To enter the quantum regime, schemes using single long-lived atomic spins, such as the electronic spin of nitrogen-vacancy (NV) centers in diamond, coupled with levitating mechanical oscillators have been proposed. At the single spin level, they offer the formidable prospect of transferring the spins’ inherent quantum nature to the oscillators, with foreseeable far-reaching implications in quantum sensing and tests of quantum mechanics. Adding the spin degrees of freedom to the experimentalists’ toolbox would enable access to a very rich playground at the crossroads between condensed matter and atomic physics. We review recent experimental work in the field of spin-mechanics that employ the interaction between trapped particles and electronic spins in the solid state and discuss the challenges ahead. Our focus is on the theoretical background close to the current experiments, as well as on the experimental limits, that, once overcome, will enable these systems to unleash their full potential.

Quantum noise properties of an injection-locked laser oscillator with pump-noise suppression and squeezed injection

1990 ◽  
Vol 41 (9) ◽  
pp. 5053-5065 ◽  
Author(s):  
Lars Gillner ◽  
Gunnar Björk ◽  
Yoshihisa Yamamoto
Keyword(s):  
Noise Suppression ◽  
Quantum Noise ◽  
Laser Oscillator

Injection-locked dual fabry-perot laser diodes for interferometric noise suppression

2015 ◽  
Author(s):  
Sang-Hwa Yoo ◽  
Myeonggyun Kye ◽  
Quoc-Hoai Tran ◽  
Chang-Hee Lee
Keyword(s):  
Noise Suppression ◽  
Laser Diodes ◽  
Fabry Perot ◽  
Interferometric Noise

Quantum-noise suppression in lasers via memory-correlation effects

1990 ◽  
Vol 42 (3) ◽  
pp. 1503-1514 ◽  
Author(s):  
Claus Benkert ◽  
Marlan O. Scully ◽  
Abbas A. Rangwala ◽  
Wolfgang Schleich
Keyword(s):  
Noise Suppression ◽  
Quantum Noise ◽  
Correlation Effects

scholarly journals Supermode-noise suppression using a nonlinear Fabry–Pérot filter in a harmonically mode-locked fiber ring laser

2002 ◽  
Vol 81 (24) ◽  
pp. 4520-4522 ◽  
Author(s):  
Donghui Zhao ◽  
Yicheng Lai ◽  
Xuewen Shu ◽  
Lin Zhang ◽  
Ian Bennion
Keyword(s):  
Ring Laser ◽  
Noise Suppression ◽  
Fiber Ring Laser ◽  
Fiber Ring ◽  
Fabry Perot

Quantum Noise Radar: Assessing Quantum Correlations

2019 ◽  
Author(s):  
D. Mogilevtsev ◽  
I. Peshko ◽  
I. Karuseichyk ◽  
A. Mikhalychev ◽  
A. P. Nizovtsev ◽  
...  
Keyword(s):  
Quantum Noise ◽  
Quantum Correlations ◽  
Noise Radar

scholarly journals Multimode Cavity Optomechanics

Proceedings ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 54
Author(s):  
Paolo Piergentili ◽  
Letizia Catalini ◽  
Mateusz Bawaj ◽  
Stefano Zippili ◽  
Nicola Malossi ◽  
...  
Keyword(s):  
Relative Motion ◽  
Coupling Strength ◽  
Single Photon ◽  
Mechanical Resonators ◽  
Cavity Optomechanics ◽  
Optomechanical System ◽  
Single Membrane ◽  
Fabry Perot ◽  
Optomechanical Coupling ◽  
Photon Coupling

We study theoretically and experimentally the behavior of an optomechanical system where two vibrating dielectric membranes are placed inside a driven Fabry-Pérot cavity. We prove that multi–element systems of mechanical resonators are suitable for enhancing optomechanical performances, and we report a ∼2.47 gain in the optomechanical coupling strength of the membrane relative motion with respect to the single membrane case. With this configuration it is possible to enable cavity optomechanics in the strong single-photon coupling regime.

scholarly journals QUANTUM NOISE INDUCED ENTANGLEMENT AND CHAOS IN THE DISSIPATIVE QUANTUM MODEL OF BRAIN

2004 ◽  
Vol 18 (06) ◽  
pp. 841-858 ◽  
Author(s):  
ELIANO PESSA ◽  
GIUSEPPE VITIELLO
Keyword(s):  
Degrees Of Freedom ◽  
Quantum Noise ◽  
Random Force ◽  
Quantum Model ◽  
Infinite Volume ◽  
Quantum Dissipation ◽  
Memory Space ◽  
Volume Limit ◽  
System Ground State ◽  
Infinite Volume Limit

We discuss some features of the dissipative quantum model of brain in the frame of the formalism of quantum dissipation. Such a formalism is based on the doubling of the system degrees of freedom. We show that the doubled modes account for the quantum noise in the fluctuating random force in the system-environment coupling. Remarkably, such a noise manifests itself through the coherent structure of the system ground state. The entanglement of the system modes with the doubled modes is shown to be permanent in the infinite volume limit. In such a limit the trajectories in the memory space are classical chaotic trajectories.

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