Quantum enhanced optical phase estimation with a squeezed thermal state
- URL: http://arxiv.org/abs/2004.05831v1
- Date: Mon, 13 Apr 2020 09:02:48 GMT
- Title: Quantum enhanced optical phase estimation with a squeezed thermal state
- Authors: Juan Yu, Yue Qin, Jinliang Qin, Hong Wang, Zhihui Yan, Xiaojun Jia,
and Kunchi Peng
- Abstract summary: Quantum phase estimation protocols can provide a measuring method of phase shift with precision superior to standard quantum limit.
A squeezed vacuum state has been pointed out a sensitive resource for quantum phase estimation.
- Score: 10.080495095463252
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum phase estimation protocols can provide a measuring method of phase
shift with precision superior to standard quantum limit (SQL) due to the
application of a nonclassical state of light. A squeezed vacuum state, whose
variance in one quadrature is lower than the corresponding SQL, has been
pointed out a sensitive resource for quantum phase estimation and the
estimation accuracy is directly influenced by the properties of the squeezed
state. Here we detailedly analyze the influence of the purity and squeezing
level of the squeezed state on the accuracy of quantum phase estimation. The
maximum precision that can be achieved for a squeezed thermal state is
evaluated, and the experimental results are in agreement with the theoretical
analyses. It is also found that the width of the phase estimation interval
$\Delta \theta $ beyond SQL is correlated with the purity of the squeezed
state.
Related papers
- Precision bounds for quantum phase estimation using two-mode squeezed Gaussian states [5.626518050662406]
We find that two-mode squeezed vacuum states are the optimal inputs and the corresponding precision bound is superior to the Heisenberg limit by a factor of 2.
Our work may demonstrate a significant and promising step towards practical quantum metrology.
arXiv Detail & Related papers (2024-07-18T12:01:19Z) - Adaptive Phase Estimation with Squeezed Vacuum Approaching the Quantum Limit [0.0]
Phase estimation plays a central role in communications, sensing, and information processing.
Quantum correlated states, such as squeezed states, enable phase estimation beyond the shot-noise limit.
Physical realizations of optimal quantum measurements for optical phase estimation with quantum-correlated states are still unknown.
arXiv Detail & Related papers (2023-12-12T19:27:04Z) - Experimental validation of the Kibble-Zurek Mechanism on a Digital
Quantum Computer [62.997667081978825]
The Kibble-Zurek mechanism captures the essential physics of nonequilibrium quantum phase transitions with symmetry breaking.
We experimentally tested the KZM for the simplest quantum case, a single qubit under the Landau-Zener evolution.
We report on extensive IBM-Q experiments on individual qubits embedded in different circuit environments and topologies.
arXiv Detail & Related papers (2022-08-01T18:00:02Z) - 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) - 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) - Bose-Einstein condensate soliton qubit states for metrological
applications [58.720142291102135]
We propose novel quantum metrology applications with two soliton qubit states.
Phase space analysis, in terms of population imbalance - phase difference variables, is also performed to demonstrate macroscopic quantum self-trapping regimes.
arXiv Detail & Related papers (2020-11-26T09:05:06Z) - Quantum-enhanced stochastic phase estimation with SU(1,1) interferometer [3.0440082886830475]
There is a standard quantum limit for phase estimation, which can be obtained with the Mach-Zehnder interferometer and coherent input state.
Here, we show that the method with the SU (1,1) interferometer can achieve the fundamental quantum scaling, surpass the Heisenberg scaling, and surpass the canonical measurement.
arXiv Detail & Related papers (2020-08-07T03:03:36Z) - Quantum sensing of open systems: Estimation of damping constants and
temperature [1.2891210250935146]
We determine quantum precision limits for estimation of damping constants and temperature of lossy bosonic channels.
A direct application would be the use of light for estimation of the absorption and the temperature of a transparent slab.
arXiv Detail & Related papers (2020-08-06T15:56:32Z) - In and out of equilibrium quantum metrology with mean-field quantum
criticality [68.8204255655161]
We study the influence that collective transition phenomena have on quantum metrological protocols.
The single spherical quantum spin (SQS) serves as stereotypical toy model that allows analytical insights on a mean-field level.
arXiv Detail & Related papers (2020-01-09T19:20:42Z) - Direct estimation of quantum coherence by collective measurements [54.97898890263183]
We introduce a collective measurement scheme for estimating the amount of coherence in quantum states.
Our scheme outperforms other estimation methods based on tomography or adaptive measurements.
We show that our method is accessible with today's technology by implementing it experimentally with photons.
arXiv Detail & Related papers (2020-01-06T03:50:42Z)
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.