The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform

Thomas Corbitt - One of the best experts on this subject based on the ideXlab platform.

  • Measurement of quantum back action in the audio band at room temperature
    Nature, 2019
    Co-Authors: Jonathan Cripe, David Follman, Nancy Aggarwal, Adam Libson, Robinjeet Singh, Garrett D. Cole, Robert Lanza, Nergis Mavalvala, Thomas Corbitt
    Abstract:

    Quantum mechanics places a fundamental limit on the precision of continuous measurements. The Heisenberg uncertainty principle dictates that as the precision of a measurement of an observable (for example, position) increases, back action creates increased uncertainty in the Conjugate Variable (for example, momentum). In interferometric gravitational-wave detectors, higher laser powers reduce the position uncertainty created by shot noise (the photon-counting error caused by the quantum nature of the laser) but necessarily do so at the expense of back action in the form of quantum radiation pressure noise (QRPN)^ 1 . Once at design sensitivity, the gravitational-wave detectors Advanced LIGO^ 2 , VIRGO^ 3 and KAGRA^ 4 will be limited by QRPN at frequencies between 10 hertz and 100 hertz. There exist several proposals to improve the sensitivity of gravitational-wave detectors by mitigating QRPN^ 5 – 10 , but until now no platform has allowed for experimental tests of these ideas. Here we present a broadband measurement of QRPN at room temperature at frequencies relevant to gravitational-wave detectors. The noise spectrum obtained shows effects due to QRPN between about 2 kilohertz and 100 kilohertz, and the measured magnitude of QRPN agrees with our model. We now have a testbed for studying techniques with which to mitigate quantum back action, such as variational readout and squeezed light injection^ 7 , with the aim of improving the sensitivity of future gravitational-wave detectors. Future gravitational-wave detectors are expected to be limited by quantum back action, which is now found in the audio band in a low-loss optomechanical system.

  • measurement of quantum back action in the audio band at room temperature
    Nature, 2019
    Co-Authors: Jonathan Cripe, David Follman, Nancy Aggarwal, Adam Libson, Robinjeet Singh, Garrett D. Cole, Robert Lanza, Nergis Mavalvala, Thomas Corbitt
    Abstract:

    Quantum mechanics places a fundamental limit on the precision of continuous measurements. The Heisenberg uncertainty principle dictates that as the precision of a measurement of an observable (for example, position) increases, back action creates increased uncertainty in the Conjugate Variable (for example, momentum). In interferometric gravitational-wave detectors, higher laser powers reduce the position uncertainty created by shot noise (the photon-counting error caused by the quantum nature of the laser) but necessarily do so at the expense of back action in the form of quantum radiation pressure noise (QRPN)1. Once at design sensitivity, the gravitational-wave detectors Advanced LIGO2, VIRGO3 and KAGRA4 will be limited by QRPN at frequencies between 10 hertz and 100 hertz. There exist several proposals to improve the sensitivity of gravitational-wave detectors by mitigating QRPN5–10, but until now no platform has allowed for experimental tests of these ideas. Here we present a broadband measurement of QRPN at room temperature at frequencies relevant to gravitational-wave detectors. The noise spectrum obtained shows effects due to QRPN between about 2 kilohertz and 100 kilohertz, and the measured magnitude of QRPN agrees with our model. We now have a testbed for studying techniques with which to mitigate quantum back action, such as variational readout and squeezed light injection7, with the aim of improving the sensitivity of future gravitational-wave detectors.

Hans-a. Bachor - One of the best experts on this subject based on the ideXlab platform.

  • Quantum measurements of spatial Conjugate Variables: displacement and tilt of a Gaussian beam.
    Optics letters, 2006
    Co-Authors: Vincent Delaubert, Nicolas Treps, Charles C. Harb, Ping Koy Lam, Hans-a. Bachor
    Abstract:

    We consider the problem of measurement of optical transverse profile parameters and their Conjugate Variable. Using multimode analysis, we introduce the concept of detection noise modes. For Gaussian beams, displacement and tilt are a pair of transverse-profile Conjugate Variables. We experimentally demonstrate the optimal encoding and detection of these Variables with a spatial homodyning scheme. Using higher-order spatial mode squeezing, we show the sub-shot-noise measurements for the displacement and tilt of a Gaussian beam.

  • Quantum measurements of spatial Conjugate Variables: Displacement and tilt of a Gaussian beam
    Optics Letters, 2006
    Co-Authors: Vincent Delaubert, Nicolas Treps, Ping Koy Lam, Charles Harb, Hans-a. Bachor
    Abstract:

    We consider the problem of measurement of optical transverse profile parameters and their Conjugate Variable. Using multi-mode analysis, we introduce the concept of detection noise-modes. For Gaussian beams, displacement and tilt are a pair of transverse profile Conjugate Variables. We experimentally demonstrate their optimal encoding and detection with a spatial homodyning scheme. Using higher order spatial mode squeezing, we show the sub-shot noise measurements for the displacement and tilt of a Gaussian beam.

Jonathan Cripe - One of the best experts on this subject based on the ideXlab platform.

  • Measurement of quantum back action in the audio band at room temperature
    Nature, 2019
    Co-Authors: Jonathan Cripe, David Follman, Nancy Aggarwal, Adam Libson, Robinjeet Singh, Garrett D. Cole, Robert Lanza, Nergis Mavalvala, Thomas Corbitt
    Abstract:

    Quantum mechanics places a fundamental limit on the precision of continuous measurements. The Heisenberg uncertainty principle dictates that as the precision of a measurement of an observable (for example, position) increases, back action creates increased uncertainty in the Conjugate Variable (for example, momentum). In interferometric gravitational-wave detectors, higher laser powers reduce the position uncertainty created by shot noise (the photon-counting error caused by the quantum nature of the laser) but necessarily do so at the expense of back action in the form of quantum radiation pressure noise (QRPN)^ 1 . Once at design sensitivity, the gravitational-wave detectors Advanced LIGO^ 2 , VIRGO^ 3 and KAGRA^ 4 will be limited by QRPN at frequencies between 10 hertz and 100 hertz. There exist several proposals to improve the sensitivity of gravitational-wave detectors by mitigating QRPN^ 5 – 10 , but until now no platform has allowed for experimental tests of these ideas. Here we present a broadband measurement of QRPN at room temperature at frequencies relevant to gravitational-wave detectors. The noise spectrum obtained shows effects due to QRPN between about 2 kilohertz and 100 kilohertz, and the measured magnitude of QRPN agrees with our model. We now have a testbed for studying techniques with which to mitigate quantum back action, such as variational readout and squeezed light injection^ 7 , with the aim of improving the sensitivity of future gravitational-wave detectors. Future gravitational-wave detectors are expected to be limited by quantum back action, which is now found in the audio band in a low-loss optomechanical system.

  • measurement of quantum back action in the audio band at room temperature
    Nature, 2019
    Co-Authors: Jonathan Cripe, David Follman, Nancy Aggarwal, Adam Libson, Robinjeet Singh, Garrett D. Cole, Robert Lanza, Nergis Mavalvala, Thomas Corbitt
    Abstract:

    Quantum mechanics places a fundamental limit on the precision of continuous measurements. The Heisenberg uncertainty principle dictates that as the precision of a measurement of an observable (for example, position) increases, back action creates increased uncertainty in the Conjugate Variable (for example, momentum). In interferometric gravitational-wave detectors, higher laser powers reduce the position uncertainty created by shot noise (the photon-counting error caused by the quantum nature of the laser) but necessarily do so at the expense of back action in the form of quantum radiation pressure noise (QRPN)1. Once at design sensitivity, the gravitational-wave detectors Advanced LIGO2, VIRGO3 and KAGRA4 will be limited by QRPN at frequencies between 10 hertz and 100 hertz. There exist several proposals to improve the sensitivity of gravitational-wave detectors by mitigating QRPN5–10, but until now no platform has allowed for experimental tests of these ideas. Here we present a broadband measurement of QRPN at room temperature at frequencies relevant to gravitational-wave detectors. The noise spectrum obtained shows effects due to QRPN between about 2 kilohertz and 100 kilohertz, and the measured magnitude of QRPN agrees with our model. We now have a testbed for studying techniques with which to mitigate quantum back action, such as variational readout and squeezed light injection7, with the aim of improving the sensitivity of future gravitational-wave detectors.

Vincent Delaubert - One of the best experts on this subject based on the ideXlab platform.

  • Quantum imaging with a small number of transverse modes
    2007
    Co-Authors: Vincent Delaubert
    Abstract:

    Spatial multi-mode quantum optics, also termed « quantum imaging », allows a study of the detection of any physical parameter within an optical image. The parameter considered here can for instance be the transverse displacement or the tilt of a laser beam, or even the bit sequence of an optical disc encoded onto the beam. Such measurements are ultimately limited by the quantum nature of optical images. We show that the use of non classical beams allows a reduction of the measurement fluctuations below the latter fundamental limit. Using this theoretical result, we have performed optimal measurements of laser beam nano-displacement, as well as entanglement between this quantity and its Conjugate Variable : beam tilt. The implementation of these experiments has led us to demonstrate all the key elements required for quantum imaging experiments. We have also investigated the possibility of using multi-mode light as parallel communication channels for quantum information.

  • Quantum measurements of spatial Conjugate Variables: displacement and tilt of a Gaussian beam.
    Optics letters, 2006
    Co-Authors: Vincent Delaubert, Nicolas Treps, Charles C. Harb, Ping Koy Lam, Hans-a. Bachor
    Abstract:

    We consider the problem of measurement of optical transverse profile parameters and their Conjugate Variable. Using multimode analysis, we introduce the concept of detection noise modes. For Gaussian beams, displacement and tilt are a pair of transverse-profile Conjugate Variables. We experimentally demonstrate the optimal encoding and detection of these Variables with a spatial homodyning scheme. Using higher-order spatial mode squeezing, we show the sub-shot-noise measurements for the displacement and tilt of a Gaussian beam.

  • Quantum measurements of spatial Conjugate Variables: Displacement and tilt of a Gaussian beam
    Optics Letters, 2006
    Co-Authors: Vincent Delaubert, Nicolas Treps, Ping Koy Lam, Charles Harb, Hans-a. Bachor
    Abstract:

    We consider the problem of measurement of optical transverse profile parameters and their Conjugate Variable. Using multi-mode analysis, we introduce the concept of detection noise-modes. For Gaussian beams, displacement and tilt are a pair of transverse profile Conjugate Variables. We experimentally demonstrate their optimal encoding and detection with a spatial homodyning scheme. Using higher order spatial mode squeezing, we show the sub-shot noise measurements for the displacement and tilt of a Gaussian beam.

O. Meza-aldama - One of the best experts on this subject based on the ideXlab platform.

  • Hyperbolic ring based formulation for thermo field dynamics, quantum dissipation, entanglement, and holography
    The European Physical Journal C, 2020
    Co-Authors: R. Cartas-fuentevilla, J. Berra-montiel, O. Meza-aldama
    Abstract:

    The classical and quantum formulations for open systems related to dissipative dynamics are constructed on a complex hyperbolic ring, following universal symmetry principles, and considering the double thermal fields approach for modeling the system of interest, and the environment. The hyperbolic rotations are revealed as an underlying internal symmetry for the dissipative dynamics, and a chemical potential is identified as Conjugate Variable to the charge operator, and thus a grand partition function is constructed. As opposed to the standard scheme, there are not patologies associated with the existence of many unitarity inequivalent representations on the hyperbolic ring, since the whole of the dissipative quantum dynamics is realized by choosing only one representation of the field commutation relations. Entanglement entropy operators for the subsystem of interest and the environment, are constructed as a tool for study the entanglement generated from the dissipation. The holographic perspectives of our results are discussed.