Protective measurement of a qubit by a qubit probe

• URL: http://arxiv.org/abs/2004.07281v1
• Date: Wed, 15 Apr 2020 18:30:51 GMT
• Title: Protective measurement of a qubit by a qubit probe
• Authors: Maximilian Schlosshauer
• Abstract summary: We study the protective measurement of a qubit by a second qubit acting as a probe. We describe the structure of the Hamiltonian that gives rise to this measurement. We propose an experimental realization of our model in an ion trap.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the protective measurement of a qubit by a second qubit acting as a probe. Consideration of this model is motivated by the possibility of its experimental implementation in multiqubit systems such as trapped ions. In our scheme, information about the expectation value of an arbitrary observable of the system qubit is encoded in the rotation of the state of the probe qubit. We describe the structure of the Hamiltonian that gives rise to this measurement and analyze the resulting dynamics under a variety of realistic conditions, such as noninfinitesimal measurement strengths, repeated measurements, non-negligible intrinsic dynamics of the probe, and interactions of the system and probe qubits with an environment. We propose an experimental realization of our model in an ion trap. The experiment may be performed with existing technology and makes use of established experimental methods for the engineering and control of Hamiltonians for quantum gates and quantum simulations of spin systems.

Related papers

• Measurement-Induced Dynamics of Particles and Quasiparticles in a Bose-Einstein-condensate array [13.35285005895192]
  Measurement plays a crucial role in a quantum system beyond just learning about the system state.<n>We focus on the case of a Bose-Einstein-condensate array, in the low-temperature and low-momentum limit.<n>We find a path to selectively measuring quasiparticle modes directly, as well as controlling over the measurement-induced creation and diffusion of quasiparticles into different momentum states.
  arXiv  Detail & Related papers  (2026-02-05T17:35:05Z)
• Entanglement with a mode observable via a tunable interaction with a qubit [0.0]
  We study the possibility of detection of spin-boson'' entanglement by qubit only measurements.<n>We take advantage of the possibility of tuning of qubit-environment coupling.
  arXiv  Detail & Related papers  (2025-12-10T13:55:01Z)
• Photonic Simulation of Localization Phenomena Using Boson Sampling [0.0]
  We propose boson sampling as an alternative compact synthetic platform performing at room temperature. By mapping the time-evolution unitary of a Hamiltonian onto an interferometer via continuous-variable gate decompositions, we present proof-of-principle results of localization characteristics of a single particle.
  arXiv  Detail & Related papers  (2024-10-17T18:00:05Z)
• Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
  We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom. We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
  arXiv  Detail & Related papers  (2023-03-13T13:06:40Z)
• Imaginary time evolution with quantum nondemolition measurements: multi-qubit interactions via measurement nonlinearities [3.0734813171130204]
  We show that quantum nondemolition (QND) measurements can be used to realize measurement-based imaginary time evolution. We show that for suitable interaction times, single qubit QND Hamiltonians can be converted to effective multi-qubit imaginary time operations.
  arXiv  Detail & Related papers  (2022-10-13T11:48:10Z)
• Quantum Back-action Limits in Dispersively Measured Bose-Einstein Condensates [0.0]
  We theoretically and experimentally characterize quantum back-action in atomic Bose-Einstein condensates interacting with a far-from resonant laser beam. We experimentally quantify the resulting wavefunction change in terms of the contrast of a Ramsey interferometer. This result is a necessary precursor for achieving true quantum back-action limited measurements of quantum gases.
  arXiv  Detail & Related papers  (2022-09-09T17:04:36Z)
• Probing finite-temperature observables in quantum simulators of spin systems with short-time dynamics [62.997667081978825]
  We show how finite-temperature observables can be obtained with an algorithm motivated from the Jarzynski equality. We show that a finite temperature phase transition in the long-range transverse field Ising model can be characterized in trapped ion quantum simulators.
  arXiv  Detail & Related papers  (2022-06-03T18:00:02Z)
• Neural-Network Quantum States for Periodic Systems in Continuous Space [66.03977113919439]
  We introduce a family of neural quantum states for the simulation of strongly interacting systems in the presence of periodicity. For one-dimensional systems we find very precise estimations of the ground-state energies and the radial distribution functions of the particles. In two dimensions we obtain good estimations of the ground-state energies, comparable to results obtained from more conventional methods.
  arXiv  Detail & Related papers  (2021-12-22T15:27:30Z)
• Dispersive readout of molecular spin qudits [68.8204255655161]
  We study the physics of a magnetic molecule described by a "giant" spin with multiple $d > 2$ spin states. We derive an expression for the output modes in the dispersive regime of operation. We find that the measurement of the cavity transmission allows to uniquely determine the spin state of the qudits.
  arXiv  Detail & Related papers  (2021-09-29T18:00:09Z)
• Visualizing spinon Fermi surfaces with time-dependent spectroscopy [62.997667081978825]
  We propose applying time-dependent photo-emission spectroscopy, an established tool in solid state systems, in cold atom quantum simulators. We show in exact diagonalization simulations of the one-dimensional $t-J$ model that the spinons start to populate previously unoccupied states in an effective band structure. The dependence of the spectral function on the time after the pump pulse reveals collective interactions among spinons.
  arXiv  Detail & Related papers  (2021-05-27T18:00:02Z)
• Quantum feedback for measurement and control [0.0]
  Experimentally, we show that continuous measurement allows one to observe the dynamics of a system undergoing simultaneous non-commuting measurements. We combine the theoretical focus on quantum feedback with the experimental capabilities of superconducting circuits to implement a feedback controlled quantum amplifier.
  arXiv  Detail & Related papers  (2020-04-21T06:00:54Z)
• Quantum probes for universal gravity corrections [62.997667081978825]
  We review the concept of minimum length and show how it induces a perturbative term appearing in the Hamiltonian of any quantum system. We evaluate the Quantum Fisher Information in order to find the ultimate bounds to the precision of any estimation procedure. Our results show that quantum probes are convenient resources, providing potential enhancement in precision.
  arXiv  Detail & Related papers  (2020-02-13T19:35:07Z)

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.