Genuine quantum non-Gaussianity and metrological sensitivity of Fock states prepared in a mechanical resonator

• URL: http://arxiv.org/abs/2412.20971v2
• Date: Fri, 03 Jan 2025 09:04:06 GMT
• Title: Genuine quantum non-Gaussianity and metrological sensitivity of Fock states prepared in a mechanical resonator
• Authors: Q. Rumman Rahman, Igor Kladarić, Max-Emanuel Kern, Yiwen Chu, Radim Filip, Matteo Fadel,
• Abstract summary: We prepare high Fock states in a high-overtone bulk acoustic wave resonator (HBAR) We characterize the experimentally realized states by employing a criterion for genuine quantum non-Gaussianity (QNG) designed to reveal multiphonon contributions. Our results have immediate applications in quantum sensing and simulations with HBAR devices.
• Score: 0.0
• License:
• Abstract: Fock states of the quantum harmonic oscillator are fundamental to quantum sensing and information processing, serving as key resources for exploiting bosonic degrees of freedom. Here, we prepare high Fock states in a high-overtone bulk acoustic wave resonator (HBAR) by coupling it to a superconducting qubit and applying microwave pulses designed using quantum optimal control. We characterize the experimentally realized states by employing a criterion for genuine quantum non-Gaussianity (QNG) designed to reveal multiphonon contributions. Although energy relaxation and decoherence limit the achievable fidelities, we demonstrate genuine QNG features compatible with Fock state $\vert 6\rangle$, confirming that the prepared states cannot be generated through Gaussian operations on states with up to Fock state $\vert 5\rangle$ contributions. We further investigate the robustness of these QNG features to losses and their utility in sensing displacement amplitudes. In particular, we introduce a hierarchy based on the quantum Fisher information and show that, despite decoherence and measurement imperfections, the prepared states achieve a displacement sensitivity surpassing that of an ideal Fock state $\vert 3\rangle$. Our results have immediate applications in quantum sensing and simulations with HBAR devices.

Related papers

• Bosonic Entanglement and Quantum Sensing from Energy Transfer in two-tone Floquet Systems [1.2499537119440245]
  Quantum-enhanced sensors, which surpass the standard quantum limit (circuit) and approach the fundamental precision limits dictated by quantum mechanics, are finding applications across a wide range of scientific fields. We introduce entanglement and preserve quantum information among many particles in a sensing circuit. We propose a superconducting-entangled sensor in the microwave regime, highlighting its potential for practical applications in high-precision measurements.
  arXiv  Detail & Related papers  (2024-10-15T00:48:01Z)
• 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)
• Quantum error mitigation for Fourier moment computation [49.1574468325115]
  This paper focuses on the computation of Fourier moments within the context of a nuclear effective field theory on superconducting quantum hardware. The study integrates echo verification and noise renormalization into Hadamard tests using control reversal gates. The analysis, conducted using noise models, reveals a significant reduction in noise strength by two orders of magnitude.
  arXiv  Detail & Related papers  (2024-01-23T19:10:24Z)
• Neural-network quantum states for ultra-cold Fermi gases [49.725105678823915]
  This work introduces a novel Pfaffian-Jastrow neural-network quantum state that includes backflow transformation based on message-passing architecture. We observe the emergence of strong pairing correlations through the opposite-spin pair distribution functions. Our findings suggest that neural-network quantum states provide a promising strategy for studying ultra-cold Fermi gases.
  arXiv  Detail & Related papers  (2023-05-15T17:46:09Z)
• Quantum process tomography of continuous-variable gates using coherent states [49.299443295581064]
  We demonstrate the use of coherent-state quantum process tomography (csQPT) for a bosonic-mode superconducting circuit. We show results for this method by characterizing a logical quantum gate constructed using displacement and SNAP operations on an encoded qubit.
  arXiv  Detail & Related papers  (2023-03-02T18:08:08Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• 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)
• Quantum non-Gaussianity of multi-phonon states of a single atom [0.7381551917607596]
  We derive the most challenging hierarchy of quantum non-Gaussian criteria for the individual mechanical Fock states. We analyze the depth of quantum non-Gaussian features under mechanical heating and predict their application in quantum sensing.
  arXiv  Detail & Related papers  (2021-11-19T09:58:22Z)
• Non-Gaussian Quantum States and Where to Find Them [0.0]
  We show how non-Gaussian states can be created by performing measurements on a subset of modes in a Gaussian state. We demonstrate that Wigner negativity is a requirement to violate Bell inequalities and to achieve a quantum computational advantage.
  arXiv  Detail & Related papers  (2021-04-26T13:59:41Z)
• Wave-function engineering via conditional quantum teleportation with non-Gaussian entanglement resource [0.0]
  We propose and analyze a setup to tailor the wave functions of the quantum states. We can generate various classes of quantum states such as Schr"odinger cat states, four-component cat states, superpositions of Fock states, and cubic phase states.
  arXiv  Detail & Related papers  (2021-02-04T01:31:11Z)
• On-demand generation of higher-order Fock states in quantum-dot--cavity systems [0.0]
  We propose and compare protocols to generate higher-order Fock states in solid state quantum-dot--cavity systems. The protocols make use of a series of laser pulses to excite the quantum dot exciton and off-resonant pulses to control the detuning between dot and cavity.
  arXiv  Detail & Related papers  (2020-06-25T16:26:57Z)

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.