Thermal intermodulation noise in cavity-based measurements

• URL: http://arxiv.org/abs/2004.05700v3
• Date: Thu, 14 May 2020 15:00:36 GMT
• Title: Thermal intermodulation noise in cavity-based measurements
• Authors: Sergey A. Fedorov, Alberto Beccari, Amirali Arabmoheghi, Dalziel J. Wilson, Nils J. Engelsen, Tobias J. Kippenberg
• Abstract summary: We show that nonlinearly transduced thermal fluctuations of cavity frequency can dominate the broadband noise in photodetection. We report and characterize thermal intermodulation noise in an optomechanical cavity, where the frequency fluctuations are caused by mechanical Brownian motion.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Thermal frequency fluctuations in optical cavities limit the sensitivity of precision experiments ranging from gravitational wave observatories to optical atomic clocks. Conventional modeling of these noises assumes a linear response of the optical field to the fluctuations of cavity frequency. Fundamentally, however, this response is nonlinear. Here we show that nonlinearly transduced thermal fluctuations of cavity frequency can dominate the broadband noise in photodetection, even when the magnitude of fluctuations is much smaller than the cavity linewidth. We term this noise "thermal intermodulation noise" and show that for a resonant laser probe it manifests as intensity fluctuations. We report and characterize thermal intermodulation noise in an optomechanical cavity, where the frequency fluctuations are caused by mechanical Brownian motion, and find excellent agreement with our developed theoretical model. We demonstrate that the effect is particularly relevant to quantum optomechanics: using a phononic crystal $Si_3N_4$ membrane with a low mass, soft-clamped mechanical mode we are able to operate in the regime where measurement quantum backaction contributes as much force noise as the thermal environment does. However, in the presence of intermodulation noise, quantum signatures of measurement are not revealed in direct photodetectors. The reported noise mechanism, while studied for an optomechanical system, can exist in any optical cavity.

Related papers

• 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)
• Squeezing for Broadband Multidimensional Variational Measurement [55.2480439325792]
  We show that optical losses inside cavity restrict back action exclusion due to loss noise. We analyze how two-photon (nondegenerate) and conventional (degenerate) squeezing improve sensitivity with account optical losses.
  arXiv  Detail & Related papers  (2023-10-06T18:41:29Z)
• Room-temperature quantum optomechanics using an ultra-low noise cavity [0.0]
  We demonstrate optomechanical squeezing at room temperature in a phononic-engineered membrane-in-the-middle system. By using a high finesse cavity whose mirrors are patterned with phononic crystal structures, we reduce cavity frequency noise by more than 700-fold. These advances enable operation within a factor of 2.5 of the Heisenberg limit, leading to squeezing of the probing field by 1.09 dB below the vacuum fluctuations.
  arXiv  Detail & Related papers  (2023-09-26T16:27:32Z)
• Unification of thermal and quantum noise in gravitational-wave detectors [0.0]
  We use the quantum fluctuation-dissipation theorem to unify all four noises. This picture shows precisely when test-mass quantization noise and optical thermal noise can be ignored.
  arXiv  Detail & Related papers  (2023-01-01T03:57:10Z)
• Nondegenerate internal squeezing: an all-optical, loss-resistant quantum technique for gravitational-wave detection [0.0]
  We investigate nondegenerate internal squeezing: optical parametric oscillation inside the signal-recycling cavity with distinct signal-mode and idler-mode frequencies. This technique is tolerant to decoherence from optical detection loss and is feasible for broadband sensitivity enhancement.
  arXiv  Detail & Related papers  (2022-06-14T00:16:42Z)
• Engineering nanoscale hypersonic phonon transport [0.0]
  Thermal vibrations represent a source of noise and dephasing for many physical processes at the quantum level. One strategy to avoid these vibrations is to structure a solid that has a phononic stop band. Here, we demonstrate the complete absence of mechanical vibrations at room temperature over a broad spectral window.
  arXiv  Detail & Related papers  (2022-02-04T14:50:20Z)
• Dissipative Quantum Feedback in Measurements Using a Parametrically Coupled Microcavity [0.0]
  Micro- and nanoscale optical or microwave cavities are used in a wide range of classical applications and quantum science experiments. Dissipative photon absorption can result in quantum feedback via in-loop field detection of the absorbed optical field. We experimentally observe such unanticipated dissipative dynamics in optomechanical spectroscopy of sideband-cooled optomechanical crystal cavities.
  arXiv  Detail & Related papers  (2021-09-29T15:12:45Z)
• Superradiance in dynamically modulated Tavis-Cumming model with spectral disorder [62.997667081978825]
  Superradiance is the enhanced emission of photons from quantum emitters collectively coupling to the same optical mode. We study the interplay between superradiance and spectral disorder in a dynamically modulated Tavis-Cummings model.
  arXiv  Detail & Related papers  (2021-08-18T21:29:32Z)
• Frequency fluctuations of ferromagnetic resonances at milliKelvin temperatures [50.591267188664666]
  Noise is detrimental to device performance, especially for quantum coherent circuits. Recent efforts have demonstrated routes to utilizing magnon systems for quantum technologies, which are based on single magnons to superconducting qubits. Researching the temporal behavior can help to identify the underlying noise sources.
  arXiv  Detail & Related papers  (2021-07-14T08:00:37Z)
• 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)
• Frequency-resolved photon correlations in cavity optomechanics [58.720142291102135]
  We analyze the frequency-resolved correlations of the photons being emitted from an optomechanical system. We discuss how the time-delayed correlations can reveal information about the dynamics of the system. This enriched understanding of the system can trigger new experiments to probe nonlinear phenomena in optomechanics.
  arXiv  Detail & Related papers  (2020-09-14T06:17:36Z)

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.