Molecular optomechanics in the anharmonic regime: from nonclassical mechanical states to mechanical lasing

• URL: http://arxiv.org/abs/2306.15152v1
• Date: Tue, 27 Jun 2023 02:17:29 GMT
• Title: Molecular optomechanics in the anharmonic regime: from nonclassical mechanical states to mechanical lasing
• Authors: Miko{\l}aj K. Schmidt and Michael J. Steel
• Abstract summary: We show that anharmonicity can effectively suppress the mechanical amplification, shifting and reshaping the onset of coherent mechanical oscillations. Our estimates indicate that both effects should be within reach of the existing implementations of the Surface Enhanced Raman Scattering.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Cavity optomechanics aims to establish optical control over vibrations of mechanical systems, to heat, cool or to drive them toward coherent, or nonclassical states. This field was recently extended to include molecular optomechanics, which describes the dynamics of THz molecular vibrations coupled to the optical fields of lossy cavities via Raman transitions, and was developed to understand the anomalous amplification of optical phonons in Surface-Enhanced Raman Scattering experiments. But the molecular platform should prove suitable for demonstrating more sophisticated optomechanical effects, including engineering of nonclassical mechanical states, or inducing coherent molecular vibrations. In this work, we propose two pathways towards implementing these effects, enabled or revealed by the strong intrinsic anharmonicities of molecular vibrations. First, to prepare a nonclassical mechanical state, we propose an incoherent analogue of the mechanical blockade, in which the molecular aharmonicity and optical response of hybrid cavities isolate the two lowest-energy vibrational states. Secondly, we show that for a strongly driven optomechanical system, the anharmonicity can effectively suppress the mechanical amplification, shifting and reshaping the onset of coherent mechanical oscillations. Our estimates indicate that both effects should be within reach of the existing implementations of the Surface Enhanced Raman Scattering, opening the pathway towards the coherent and nonclassical effects in molecular optomechanics.

Related papers

• Nanocavities for Molecular Optomechanics: their fundamental description and applications [0.0]
  This Perspective is to clarify the connection between the languages and parameters used in the fields of molecular cavity optomechanics. We aim to make the theoretical framework of molecular cavity optomechanics practically usable for the SERS and nanoplasmonics community at large.
  arXiv  Detail & Related papers  (2024-09-19T07:54:20Z)
• Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
  We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide. When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits. We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
  arXiv  Detail & Related papers  (2024-08-30T15:54:33Z)
• Limits for coherent optical control of quantum emitters in layered materials [49.596352607801784]
  coherent control of a two-level system is among the most essential challenges in modern quantum optics. We use a mechanically isolated quantum emitter in hexagonal boron nitride to explore the individual mechanisms which affect the coherence of an optical transition under resonant drive. New insights on the underlying physical decoherence mechanisms reveals a limit in temperature until which coherent driving of the system is possible.
  arXiv  Detail & Related papers  (2023-12-18T10:37:06Z)
• Multi-level Purcell effect and the impact of vibrational modes in molecular quantum optics [62.997667081978825]
  We study a manifestation of the Purcell effect in a bio-inspired photosynthetic dimer. We provide a theoretical picture in terms of an effective non-Hermitian Hamiltonian.
  arXiv  Detail & Related papers  (2023-06-15T18:27:40Z)
• Strong mechanical squeezing in a microcavity with double quantum wells [0.0]
  In a hybrid quantum system composed of two quantum wells placed inside a cavity with a moving end mirror pumped by bichromatic coherent light, we address the formation of squeezed states of a mechanical resonator. We show that the robustness of this squeezing against thermal fluctuations is important for practical applications of such systems.
  arXiv  Detail & Related papers  (2023-02-01T16:00:55Z)
• Dissipative Optomechanics in High-Frequency Nanomechanical Resonators [0.0]
  We show the first dissipative optomechanical system operating in the sideband-resolved regime, where the mechanical frequency is larger than the optical linewidth. Our figures represent a two-order-of-magnitude leap in the mechanical frequency and a tenfold increase in the dissipative optomechanical coupling rate compared to previous works.
  arXiv  Detail & Related papers  (2022-12-30T03:16:31Z)
• Phononically shielded photonic-crystal mirror membranes for cavity quantum optomechanics [48.7576911714538]
  We present a highly reflective, sub-wavelength-thick membrane resonator featuring high mechanical quality factor. We construct a Fabry-Perot-type optical cavity, with the membrane forming one terminating mirror. We demonstrate optomechanical sideband cooling to mK-mode temperatures, starting from room temperature.
  arXiv  Detail & Related papers  (2022-12-23T04:53:04Z)
• Localized vibrational modes in waveguide quantum optomechanics with spontaneously broken PT symmetry [117.44028458220427]
  We study theoretically two vibrating quantum emitters trapped near a one-dimensional waveguide and interacting with propagating photons. In the regime of strong optomechanical interaction the light-induced coupling of emitter vibrations can lead to formation of spatially localized vibration modes, exhibiting parity-time symmetry breaking.
  arXiv  Detail & Related papers  (2021-06-29T12:45:44Z)
• Waveguide quantum optomechanics: parity-time phase transitions in ultrastrong coupling regime [125.99533416395765]
  We show that the simplest set-up of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction. The combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (PT) symmetry. The $mathcalPT$ phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.
  arXiv  Detail & Related papers  (2020-07-04T11:02:20Z)
• Entanglement Dynamics in Dispersive Optomechanics: Non-Classicality and Revival [0.0]
  We study entanglement dynamics in dispersive optomechanical systems consisting of two optical modes and a mechanical oscillator inside an optical cavity. The appearance of optical entanglement witnesses non-classicality of the oscillator. An experimental realization with ultracold atomic ensembles is proposed.
  arXiv  Detail & Related papers  (2020-06-03T18:04:21Z)
• Stroboscopic quantum optomechanics [0.0]
  We show that ground-state cooling and mechanical squeezing can be achieved, even in the presence of mechanical dissipation. We provide a full quantum-mechanical treatment of stroboscopic backaction-evading measurements.
  arXiv  Detail & Related papers  (2020-03-09T19:00:58Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.