Quantum metrology with boundary time crystals
- URL: http://arxiv.org/abs/2301.02103v2
- Date: Tue, 24 Oct 2023 08:41:00 GMT
- Title: Quantum metrology with boundary time crystals
- Authors: V. Montenegro, M. G. Genoni, A. Bayat, M. G. A. Paris
- Abstract summary: We show that a transition from a symmetry unbroken into a boundary time crystal phase reveals quantum-enhanced sensitivity quantified through quantum Fisher information.
Our scheme is indeed a demonstration of harnessing decoherence for achieving quantum-enhanced sensitivity.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum sensing is one of the arenas that exemplifies the superiority of
quantum technologies over their classical counterparts. Such superiority,
however, can be diminished due to unavoidable noise and decoherence of the
probe. Thus, metrological strategies to fight against or profit from
decoherence are highly desirable. This is the case of certain types of
decoherence-driven many-body systems supporting dissipative phase transitions,
which might be helpful for sensing. Boundary time crystals are exotic
dissipative phases of matter in which the time-translational symmetry is
broken, and long-lasting oscillations emerge in open quantum systems at the
thermodynamic limit. We show that the transition from a symmetry unbroken into
a boundary time crystal phase, described by a second-order transition, reveals
quantum-enhanced sensitivity quantified through quantum Fisher information. We
also determine the critical exponents of the system and establish their
relationship. Our scheme is indeed a demonstration of harnessing decoherence
for achieving quantum-enhanced sensitivity. From a practical perspective, it
has the advantage of being independent of initialization and can be captured by
a simple measurement.
Related papers
- Thermalization and Criticality on an Analog-Digital Quantum Simulator [133.58336306417294]
We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution.
We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions.
We digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization.
arXiv Detail & Related papers (2024-05-27T17:40:39Z) - Hysteresis and Self-Oscillations in an Artificial Memristive Quantum Neuron [79.16635054977068]
We study an artificial neuron circuit containing a quantum memristor in the presence of relaxation and dephasing.
We demonstrate that this physical principle enables hysteretic behavior of the current-voltage characteristics of the quantum device.
arXiv Detail & Related papers (2024-05-01T16:47:23Z) - Probing critical phenomena in open quantum systems using atom arrays [3.365378662696971]
At quantum critical points, correlations decay as a power law, with exponents determined by a set of universal scaling dimensions.
Here, we employ a Rydberg quantum simulator to adiabatically prepare critical ground states of both a one-dimensional ring and a two-dimensional square lattice.
By accounting for and tuning the openness of our quantum system, we are able to directly observe power-law correlations and extract the corresponding scaling dimensions.
arXiv Detail & Related papers (2024-02-23T15:21:38Z) - Orthogonality catastrophe and quantum speed limit for dynamical quantum
phase transition [3.8018284259144344]
We show that exact zeros of the Loschmidt echo can exist in finite-size systems for specific discrete values.
We find the possibility of using the quantum speed limit to detect the critical point of a static quantum phase transition.
arXiv Detail & Related papers (2023-08-09T03:48:06Z) - Continuous sensing and parameter estimation with the boundary
time-crystal [0.0]
A boundary time-crystal is a quantum many-body system whose dynamics is governed by the competition between coherent driving and collective dissipation.
The best achievable sensitivity is proportional to $sqrtTN$, i.e., it follows the standard quantum limit in time and Heisenberg scaling in the particle number.
We demonstrate that the standard quantum limit can be surpassed by cascading two time-crystals, where the quantum trajectories of one time-crystal are used as input for the other one.
arXiv Detail & Related papers (2023-07-25T06:18:59Z) - Universality of critical dynamics with finite entanglement [68.8204255655161]
We study how low-energy dynamics of quantum systems near criticality are modified by finite entanglement.
Our result establishes the precise role played by entanglement in time-dependent critical phenomena.
arXiv Detail & Related papers (2023-01-23T19:23:54Z) - Demonstrating Quantum Microscopic Reversibility Using Coherent States of
Light [58.8645797643406]
We propose and experimentally test a quantum generalization of the microscopic reversibility when a quantum system interacts with a heat bath.
We verify that the quantum modification for the principle of microscopic reversibility is critical in the low-temperature limit.
arXiv Detail & Related papers (2022-05-26T00:25:29Z) - Quantum simulation of parity-time symmetry breaking with a
superconducting quantum processor [0.0]
We simulate the evolution under such Hamiltonians in the quantum regime on a superconducting quantum processor.
In a two-qubit setting, we show that the entanglement can be modified by local operations.
arXiv Detail & Related papers (2021-11-23T17:43:44Z) - Enhanced nonlinear quantum metrology with weakly coupled solitons and
particle losses [58.720142291102135]
We offer an interferometric procedure for phase parameters estimation at the Heisenberg (up to 1/N) and super-Heisenberg scaling levels.
The heart of our setup is the novel soliton Josephson Junction (SJJ) system providing the formation of the quantum probe.
We illustrate that such states are close to the optimal ones even with moderate losses.
arXiv Detail & Related papers (2021-08-07T09:29:23Z) - Experimental Adiabatic Quantum Metrology with the Heisenberg scaling [21.42706958416718]
We propose an adiabatic scheme on a perturbed Ising spin model with the first order quantum phase transition.
We experimentally implement the adiabatic scheme on the nuclear magnetic resonance and show that the achieved precision attains the Heisenberg scaling.
arXiv Detail & Related papers (2021-02-14T03:08:54Z) - Entropic Uncertainty Relations and the Quantum-to-Classical transition [77.34726150561087]
We aim to shed some light on the quantum-to-classical transition as seen through the analysis of uncertainty relations.
We employ entropic uncertainty relations to show that it is only by the inclusion of imprecision in our model of macroscopic measurements that we can prepare a system with two simultaneously well-defined quantities.
arXiv Detail & Related papers (2020-03-04T14:01:17Z)
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.