Strong optomechanical coupling at room temperature by coherent scattering

AbstractQuantum control of a system requires the manipulation of quantum states faster than any decoherence rate. For mesoscopic systems, this has so far only been reached by few cryogenic systems. An important milestone towards quantum control is the so-called strong coupling regime, which in cavity optomechanics corresponds to an optomechanical coupling strength larger than cavity decay rate and mechanical damping. Here, we demonstrate the strong coupling regime at room temperature between a levitated silica particle and a high finesse optical cavity. Normal mode splitting is achieved by employing coherent scattering, instead of directly driving the cavity. The coupling strength achieved here approaches three times the cavity linewidth, crossing deep into the strong coupling regime. Entering the strong coupling regime is an essential step towards quantum control with mesoscopic objects at room temperature.

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Advances in the Realisation of GaN-Based Microcavities: Towards Strong Coupling at Room Temperature

MRS Proceedings ◽

10.1557/proc-798-y6.5 ◽

2003 ◽

Vol 798 ◽

Author(s):

F. Semond ◽

D. Byrne ◽

F. Natali ◽

M. Leroux ◽

J. Massies ◽

...

Keyword(s):

Molecular Beam Epitaxy ◽

Strong Coupling ◽

Silicon Substrate ◽

Room Temperature ◽

Molecular Beam ◽

Optical Cavity ◽

Strong Coupling Regime ◽

Rabi Splitting ◽

Dielectric Mirror ◽

High Finesse

ABSTRACTIn a recent paper [Phys. Rev. B 68, 153313 (2003)], we reported the first experimental observation of the strong coupling regime in a GaN-based microcavity. The λ/2 GaN optical cavity was grown by molecular beam epitaxy on a Si(111) substrate. The upper mirror is a SiO2/Si3N4 dielectric mirror and the silicon substrate acts as the bottom mirror. With such a relatively simple and low-finesse microcavity, a Rabi splitting of 31 meV was measured at 5K. On the basis of this very encouraging result, approaches to fabricate high-finesse GaN-based cavities exhibiting strong coupling with stable polaritons at room temperature are discussed.

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Fluorescence enhancement and strong-coupling in faceted plasmonic nanocavities

EPJ Applied Metamaterials ◽

10.1051/epjam/2018004 ◽

2018 ◽

Vol 5 ◽

pp. 6 ◽

Cited By ~ 5

Author(s):

Nuttawut Kongsuwan ◽

Angela Demetriadou ◽

Rohit Chikkaraddy ◽

Jeremy J. Baumberg ◽

Ortwin Hess

Keyword(s):

Strong Coupling ◽

Single Molecule ◽

Coupling Strength ◽

Room Temperature ◽

Optical Cavity ◽

Field Enhancement ◽

Plasmonic Nanostructures ◽

Quantum Emitter ◽

Highly Sensitive ◽

Shed Light

Emission properties of a quantum emitter can be significantly modified inside nanometre-sized gaps between two plasmonic nanostructures. This forms a nanoscopic optical cavity which allows single-molecule detection and single-molecule strong-coupling at room temperature. However, plasmonic resonances of a plasmonic nanocavity are highly sensitive to the exact gap morphology. In this article, we shed light on the effect of gap morphology on the plasmonic resonances of a faceted nanoparticle-on-mirror (NPoM) nanocavity and their interaction with quantum emitters. We find that with increasing facet width the NPoM nanocavity provides weaker field enhancement and thus less coupling strength to a single quantum emitter since the effective mode volume increases with the facet width. However, if multiple emitters are present, a faceted NPoM nanocavity is capable of accommodating a larger number of emitters, and hence the overall coupling strength is larger due to the collective and coherent energy exchange from all the emitters. Our findings pave the way to more efficient designs of nanocavities for room-temperature light-matter strong-coupling, thus providing a big step forward to a non-cryogenic platform for quantum technologies.

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Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime

Entropy ◽

10.3390/e23080966 ◽

2021 ◽

Vol 23 (8) ◽

pp. 966

Author(s):

Ahmad Shafiei Aporvari ◽

David Vitali

Keyword(s):

Strong Coupling ◽

Quantum Control ◽

Cavity Mode ◽

Quantum Information Processing ◽

Single Photon ◽

Strong Coupling Regime ◽

Optomechanical System ◽

Effective Dynamics ◽

Optomechanical Coupling ◽

Cavity Optomechanical System

Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation–pressure interaction between the mechanical and the electromagnetic modes is typically very weak, harnessing up to now the demonstration of interesting nonlinear dynamics and quantum control at the single photon level. It has already been shown both theoretically and experimentally that if the interaction is mediated by a Josephson circuit, one can have an effective dynamics corresponding to a huge enhancement of the single-photon optomechanical coupling. Here we analyze in detail this phenomenon in the general case when the cavity mode and the mechanical mode interact via an off-resonant qubit. Using a Schrieffer–Wolff approximation treatment, we determine the regime where this tripartite hybrid system behaves as an effective cavity optomechanical system in the strong coupling regime.

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Strong Coupling: Polariton Bose Condensation

10.1093/oso/9780198782995.003.0008 ◽

2017 ◽

Author(s):

Alexey V. Kavokin ◽

Jeremy J. Baumberg ◽

Guillaume Malpuech ◽

Fabrice P. Laussy

Keyword(s):

Strong Coupling ◽

Room Temperature ◽

Elevated Temperatures ◽

Dissipative System ◽

Bose Condensation ◽

Einstein Condensation ◽

Strong Coupling Regime ◽

Stimulated Scattering ◽

Exciton Polaritons ◽

Bose Einstein

In this Chapter we address the physics of Bose-Einstein condensation and its implications to a driven-dissipative system such as the polariton laser. We discuss the dynamics of exciton-polaritons non-resonantly pumped within a microcavity in the strong coupling regime. It is shown how the stimulated scattering of exciton-polaritons leads to formation of bosonic condensates that may be stable at elevated temperatures, including room temperature.

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Strong optomechanical coupling at room temperature by coherent scattering

Optical Trapping and Optical Micromanipulation XVIII ◽

10.1117/12.2595438 ◽

2021 ◽

Author(s):

Nadine Meyer ◽

Andres de los Rios Sommer ◽

Romain Quidant

Keyword(s):

Room Temperature ◽

Coherent Scattering ◽

Optomechanical Coupling

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Entropic analysis of optomechanical entanglement for a nanomechanical resonator coupled to an optical cavity field

SciPost Physics Core ◽

10.21468/scipostphyscore.4.3.024 ◽

2021 ◽

Vol 4 (3) ◽

Author(s):

Jeong Ryeol Choi

Keyword(s):

Coupling Strength ◽

Optical Cavity ◽

Von Neumann Entropy ◽

Strong Coupling Regime ◽

Optical Frequency ◽

Cavity Field ◽

Quantum Networks ◽

Nanomechanical Resonator ◽

Von Neumann ◽

Quantum Science

We investigate entanglement dynamics for a nanomechanical resonator coupled to an optical cavity field through the analysis of the associated entanglement entropies. The effects of time variation of several parameters, such as the optical frequency and the coupling strength, on the evolution of entanglement entropies are analyzed. We consider three kinds of entanglement entropies as the measures of the entanglement of subsystems, which are the linear entropy, the von Neumann entropy, and the Rényi entropy. The analytic formulae of these entropies are derived in a rigorous way using wave functions of the system. In particular, we focus on time behaviors of entanglement entropies in the case where the optical frequency is modulated by a small oscillating factor. We show that the entanglement entropies emerge and increase as the coupling strength grows from zero. The entanglement entropies fluctuate depending on the adiabatic variation of the parameters and such fluctuations are significant especially in the strong coupling regime. Our research may deepen the understanding of the optomechanical entanglement, which is crucial in realizing hybrid quantum-information protocols in quantum computation, quantum networks, and other domains in quantum science.

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Kick and Fix: The Roots of Quantum Control

Proceedings ◽

10.3390/proceedings2019012030 ◽

2019 ◽

Vol 12 (1) ◽

pp. 30 ◽

Cited By ~ 2

Author(s):

Paolo Facchi ◽

Saverio Pascazio

Keyword(s):

Strong Coupling ◽

Quantum Control ◽

Strong Coupling Regime ◽

Historical Survey ◽

Adiabatic Theorem ◽

Zeno Effect ◽

Crucial Problem ◽

Exponential Operator ◽

Product Formulas

When two operators A and B do not commute, the calculation of the exponential operator e A + B is a difficult and crucial problem. The applications are vast and diversified: to name but a few examples, quantum evolutions, product formulas, quantum control, Zeno effect. The latter are of great interest in quantum applications and quantum technologies. We present here a historical survey of results and techniques, and discuss differences and similarities. We also highlight the link with the strong coupling regime, via the adiabatic theorem, and contend that the “pulsed” and “continuous” formulations differ only in the order by which two limits are taken, and are but two faces of the same coin.

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ZnO nano-pillar Resonators with Coaxial Bragg-Reflectors

MRS Proceedings ◽

10.1557/proc-1178-aa10-13 ◽

2009 ◽

Vol 1178 ◽

Cited By ~ 1

Author(s):

Rudiger Schmidt-Grund ◽

Annekatrin Hinkel ◽

Helena Hilmer ◽

Jesus Zúñiga-Pérez ◽

Chris Sturm ◽

...

Keyword(s):

Strong Coupling ◽

Coupling Strength ◽

Strong Coupling Regime ◽

Emission Rates ◽

Bragg Reflectors ◽

Free Standing ◽

Spatially Resolved ◽

Pillar Diameter ◽

Photonic Wire ◽

Photon Coupling

AbstractWe demonstrate the growth of lateral concentric BR on ZnO nano-pillars. It opens the opportunity to be used for (i) the enhancement of the lateral confinement in classical pillar-resonators in order to increase the emission rates in the regime of weak exciton-photon coupling (Purcell-effect), (ii) to enhance the exciton-polariton coupling strength in the strong-coupling regime, and (iii) to be used for two-dimensional confinement in free-standing photonic wire resonators. Spatially resolved PL experiments in dependence on the pillar diameter and on the temperature provide strong hints for the ZnO nano-pillar resonator being in the strong-coupling regime. The coupling strength can be estimated to be V = 80 meV.

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