Quantum noise and vacuum fluctuations in balanced homodyne detections through ideal multi-mode detectors

• URL: http://arxiv.org/abs/2107.05614v3
• Date: Fri, 20 Aug 2021 10:29:19 GMT
• Title: Quantum noise and vacuum fluctuations in balanced homodyne detections through ideal multi-mode detectors
• Authors: Kouji Nakamura
• Abstract summary: The balanced homodyne detection as a readout scheme of gravitational-wave detectors is carefully examined from the quantum field theoretical point of view. The readout scheme in gravitational-wave detectors specifies the directly measured quantum operator in the detection.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The balanced homodyne detection as a readout scheme of gravitational-wave detectors is carefully examined from the quantum field theoretical point of view. The readout scheme in gravitational-wave detectors specifies the directly measured quantum operator in the detection. This specification is necessary when we apply the recently developed quantum measurement theory to gravitational-wave detections. We examine the two models of measurement. One is the model in which the directly measured quantum operator at the photodetector is Glauber's photon number operator, and the other is the model in which the power operator of the optical field is directly measured. These two are regarded as ideal models of photodetectors. We first show these two models yield the same expectation value of the measurement. Since it is consensus in the gravitational-wave community that vacuum fluctuations contribute to the noises in the detectors, we also clarify the contributions of vacuum fluctuations to the quantum noise spectral density without using the two-photon formulation which is used in the gravitational-wave community. We found that the conventional noise spectral density in the two-photon formulation includes vacuum fluctuations from the main interferometer but does not include those from the local oscillator. Although the contribution of vacuum fluctuations from the local oscillator theoretically yields the difference between the above two models in the noise spectral densities, this difference is negligible in realistic situations.

Related papers

• Probing the massive scalar mode in the levitated sensor detector of gravitational wave [0.0]
  We show that the recently designed levitated sensor detector citeAggarwal of gravitational wave has a better chance of detecting both the scalar and tensor modes at different frequencies. By adjusting the intensity of the optical beam the frequency of the harmonic potential trap can be varied widely. We demonstrate that the dynamics of the sensor mass obeys a geodesic deviation equation in the proper detector frame.
  arXiv  Detail & Related papers  (2024-10-18T13:57:35Z)
• A Quantum Theory of Temporally Mismatched Homodyne Measurements with Applications to Optical Frequency Comb Metrology [39.58317527488534]
  We derive measurement operators for homodyne detection with arbitrary mode overlap. These operators establish a foundation to extend frequency-comb interferometry to a wide range of scenarios.
  arXiv  Detail & Related papers  (2023-10-05T22:49:50Z)
• Engineering the impact of phonon dephasing on the coherence of a WSe$_{2}$ single-photon source via cavity quantum electrodynamics [36.88715167286119]
  Emitter dephasing is one of the key issues in the performance of solid-state single photon sources. We show that it is possible to tune and engineer the coherence of photons emitted from a single WSe$$ monolayer dot via selectively coupling it to a spectral cavity resonance.
  arXiv  Detail & Related papers  (2023-07-13T16:41:06Z)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• Single-Photon Signal Sideband Detection for High-Power Michelson Interferometers [0.0]
  The Michelson interferometer is a cornerstone of experimental physics. Interferometer precision provides a unique view of the fundamental medium of matter and energy.
  arXiv  Detail & Related papers  (2022-11-08T05:27:15Z)
• Optimal interferometry for Bell$-$nonclassicality by a vacuum$-$one$-$photon qubit [0.0]
  Bell nonclassicality of a single photon superposition in two modes is one of the most striking nonclassical phenomena discussed in the context of quantum physics. We show how to robustly violate local realism within the weak-field homodyne measurement scheme for textitany superposition of one photon with vacuum.
  arXiv  Detail & Related papers  (2021-09-21T13:37:07Z)
• Two-photon resonance fluorescence of two interacting non-identical quantum emitters [77.34726150561087]
  We study a system of two interacting, non-indentical quantum emitters driven by a coherent field. We show that the features imprinted by the two-photon dynamics into the spectrum of resonance fluorescence are particularly sensitive to changes in the distance between emitters. This can be exploited for applications such as superresolution imaging of point-like sources.
  arXiv  Detail & Related papers  (2021-06-04T16:13:01Z)
• Vacuum fluctuations and balanced homodyne detection through ideal multi-mode photon number or power counting detectors [0.0]
  The balanced homodyne detection as a readout scheme of gravitational-wave detectors is carefully examined. This specification is necessary to apply the quantum measurement theory to gravitational-wave detections.
  arXiv  Detail & Related papers  (2021-01-28T07:09:17Z)
• Quantum optomechanical system in a Mach-Zehnder interferometer [0.0]
  We show that squeezed light can be generated by pure scattering on a quantum system, without involving a cavity. The squeezing can be detected at the output ports of the interferometer either by direct detection or by measuring the spectrum of the difference current.
  arXiv  Detail & Related papers  (2021-01-22T09:17:34Z)
• Hyperentanglement in structured quantum light [50.591267188664666]
  Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes. We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
  arXiv  Detail & Related papers  (2020-06-02T18:00:04Z)
• Theory of waveguide-QED with moving emitters [68.8204255655161]
  We study a system composed by a waveguide and a moving quantum emitter in the single excitation subspace. We first characterize single-photon scattering off a single moving quantum emitter, showing both nonreciprocal transmission and recoil-induced reduction of the quantum emitter motional energy.
  arXiv  Detail & Related papers  (2020-03-20T12:14:10Z)

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.