Quantum-Enhanced Multi-Parameter Sensing in a Single Mode

• URL: http://arxiv.org/abs/2412.04865v1
• Date: Fri, 06 Dec 2024 08:58:19 GMT
• Title: Quantum-Enhanced Multi-Parameter Sensing in a Single Mode
• Authors: Christophe H. Valahu, Matthew P. Stafford, Zixin Huang, Vassili G. Matsos, Maverick J. Millican, Teerawat Chalermpusitarak, Nicolas C. Menicucci, Joshua Combes, Ben Q. Baragiola, Ting Rei Tan,
• Abstract summary: We demonstrate measurements of small changes in position and momentum where the uncertainties are simultaneously reduced below the standard quantum limit. Our experiment uses grid states to measure small changes in position and momentum and shows a metrological gain of up to 5.1(5)dB over the simultaneous measurement.
• Score: 0.0
• License:
• Abstract: Precision metrology underpins scientific and technological advancements. Quantum metrology offers a pathway to surpass classical sensing limits by leveraging quantum states and measurement strategies. However, measuring multiple incompatible observables suffers from quantum backaction, where measurement of one observable pollutes a subsequent measurement of the other. This is a manifestation of Heisenberg's uncertainty principle for two non-commuting observables, such as position and momentum. Here, we demonstrate measurements of small changes in position and momentum where the uncertainties are simultaneously reduced below the standard quantum limit (SQL). We measure $\textit{modular observables}$ using tailored, highly non-classical states that ideally evade measurement backactions. The states are deterministically prepared in the single mode of the mechanical motion of a trapped ion using an optimal quantum control protocol. Our experiment uses grid states to measure small changes in position and momentum and shows a metrological gain of up to 5.1(5)~dB over the simultaneous SQL. Using an adaptive-phase estimation algorithm with Bayesian inference, we estimate these displacements with a combined variance of 2.6(1.1)~dB below the SQL. Furthermore, we examine simultaneously estimating $\textit{number}$ and $\textit{phase}$, which are the polar counterparts of position and momentum. This is performed by preparing a novel quantum resource -- number-phase states -- and we demonstrate a metrological gain over their SQL. The combination of quantum control and multi-parameter quantum metrology marks a significant step towards unprecedented precision with applications ranging from fundamental physics to advanced quantum technologies.

Related papers

• Quantum metrology with a continuous-variable system [0.0]
  We discuss precision limits and optimal strategies in quantum metrology and sensing with a single mode of quantum continuous variables. We summarize some of the main experimental achievements and present emerging platforms for continuous-variable sensing.
  arXiv  Detail & Related papers  (2024-11-06T18:57:07Z)
• First Hitting Times on a Quantum Computer: Tracking vs. Local Monitoring, Topological Effects, and Dark States [1.352425155225249]
  We investigate a quantum walk on a ring represented by a directed triangle graph with complex edge weights. The first hitting time statistics are recorded using unitary dynamics interspersed stroboscopically by measurements. We conclude that, for the IBM quantum computer under study, the first hitting times of monitored quantum walks are resilient to noise.
  arXiv  Detail & Related papers  (2024-02-24T15:59:25Z)
• Variational method for learning Quantum Channels via Stinespring Dilation on neutral atom systems [0.0]
  Quantum systems interact with their environment, resulting in non-reversible evolutions. For many quantum experiments, the time until which measurements can be done might be limited. We introduce a method to approximate a given target quantum channel by means of variationally approximating equivalent unitaries on an extended system.
  arXiv  Detail & Related papers  (2023-09-19T13:06:44Z)
• Observation of partial and infinite-temperature thermalization induced by repeated measurements on a quantum hardware [62.997667081978825]
  We observe partial and infinite-temperature thermalization on a quantum superconducting processor. We show that the convergence does not tend to a completely mixed (infinite-temperature) state, but to a block-diagonal state in the observable basis.
  arXiv  Detail & Related papers  (2022-11-14T15:18:11Z)
• Quantum neuromorphic approach to efficient sensing of gravity-induced entanglement [1.7616042687330642]
  We propose a platform for measuring entanglement by connecting objects of interest to an uncontrolled quantum network. As the network effectively learns to recognise quantum states, it is possible to sense the amount of entanglement after training with only non-entangled states. By taking into account measurement errors, we demonstrate entanglement sensing with precision that scales beyond the standard quantum limit.
  arXiv  Detail & Related papers  (2022-09-29T06:05:44Z)
• 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)
• Observing a Topological Transition in Weak-Measurement-Induced Geometric Phases [55.41644538483948]
  Weak measurements in particular, through their back-action on the system, may enable various levels of coherent control. We measure the geometric phases induced by sequences of weak measurements and demonstrate a topological transition in the geometric phase controlled by measurement strength. Our results open new horizons for measurement-enabled quantum control of many-body topological states.
  arXiv  Detail & Related papers  (2021-02-10T19:00:00Z)
• 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 hypothesis testing in many-body systems [0.0]
  In quantum mechanics, the latter type of measurements can be studied and optimized using the framework of quantum hypothesis testing. We consider the application of quantum hypothesis testing to quantum many-body systems and quantum field theory.
  arXiv  Detail & Related papers  (2020-07-22T22:53:04Z)
• Quantum Zeno effect appears in stages [64.41511459132334]
  In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates. We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
  arXiv  Detail & Related papers  (2020-03-23T18:17:36Z)

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.