Measuring out-of-time-order correlators on a quantum computer based on an irreversibility-susceptibility method
- URL: http://arxiv.org/abs/2512.22643v1
- Date: Sat, 27 Dec 2025 16:33:19 GMT
- Title: Measuring out-of-time-order correlators on a quantum computer based on an irreversibility-susceptibility method
- Authors: Haruki Emori, Hiroyasu Tajima,
- Abstract summary: We present an experimental evaluation of the out-of-time-ordered correlator (OTOC) on a quantum computer.<n>Our experiments investigate the quantum dynamics of an XXZ spin-1/2 chain prepared in a thermal Gibbs state.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The out-of-time-ordered correlator (OTOC) is a powerful tool for probing quantum information scrambling, a fundamental process by which local information spreads irreversibly throughout a quantum many-body system. Experimentally measuring the OTOC, however, is notoriously challenging due to the need for time-reversed evolution. Here, we present an experimental evaluation of the OTOC on a quantum computer, using three distinct protocols to address this challenge: the rewinding time method (RTM), the weak-measurement method (WMM), and the irreversibility-susceptibility method (ISM). Our experiments investigate the quantum dynamics of an XXZ spin-1/2 chain prepared in a thermal Gibbs state. As a key contribution, we provide the first experimental demonstration of the ISM, using the numerical emulator of the trapped-ion quantum computer, reimei. We also conduct a detailed comparative analysis of all three methods, revealing method-dependent behaviors in the measured OTOC. This work not only validates these protocols as practical tools for exploring quantum chaos on near-term hardware but also offers crucial insights into their respective advantages and limitations, providing a practical framework for future experimental investigations.
Related papers
- Study on quantum thermalization from thermal initial states in a superconducting quantum computer [0.0]
We propose a protocol to indirectly address the difficulty in preparing thermal states.<n>We experimentally validate our protocol using IBM quantum devices, providing results for unusual relaxation in quenches.<n>This demonstration underscores that our protocol can provide an alternative way of studying thermal states physics.
arXiv Detail & Related papers (2024-01-16T09:01:01Z) - Quantum correlation generation capability of experimental processes [5.552315676636436]
EPR steering and Bell nonlocality illustrate two different kinds of correlations predicted by quantum mechanics.
We show that the capability of an experimental process to create quantum correlations can be quantified.
We demonstrate this utility by examining the experimental capability of creating quantum correlations with the controlled-phase operations on the IBM Quantum Experience and Amazon Braket Rigetti superconducting quantum computers.
arXiv Detail & Related papers (2023-04-30T02:22:56Z) - Measurement-induced entanglement and teleportation on a noisy quantum
processor [105.44548669906976]
We investigate measurement-induced quantum information phases on up to 70 superconducting qubits.
We use a duality mapping, to avoid mid-circuit measurement and access different manifestations of the underlying phases.
Our work demonstrates an approach to realize measurement-induced physics at scales that are at the limits of current NISQ processors.
arXiv Detail & Related papers (2023-03-08T18:41:53Z) - 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) - Dispersive qubit readout with machine learning [0.08399688944263842]
Open quantum systems can undergo dissipative phase transitions, and their critical behavior can be exploited in sensing applications.
A recently introduced measurement protocol uses the parametric (two-photon driven) Kerr resonator's driven-dissipative phase transition to reach single-qubit detection fidelity of 99.9%.
We use machine learning-based classification algorithms to extract information from this critical dynamics.
arXiv Detail & Related papers (2021-12-10T04:25:43Z) - On exploring the potential of quantum auto-encoder for learning quantum systems [60.909817434753315]
We devise three effective QAE-based learning protocols to address three classically computational hard learning problems.
Our work sheds new light on developing advanced quantum learning algorithms to accomplish hard quantum physics and quantum information processing tasks.
arXiv Detail & Related papers (2021-06-29T14:01:40Z) - Experimental verification of fluctuation relations with a quantum
computer [68.8204255655161]
We use a quantum processor to experimentally validate a number of theoretical results in non-equilibrium quantum thermodynamics.
Our experiments constitute the experimental basis for the understanding of the non-equilibrium energetics of quantum computation.
arXiv Detail & Related papers (2021-06-08T14:16:12Z) - Probing quantum information propagation with out-of-time-ordered
correlators [41.12790913835594]
Small-scale quantum information processors hold the promise to efficiently emulate many-body quantum systems.
Here, we demonstrate the measurement of out-of-time-ordered correlators (OTOCs)
A central requirement for our experiments is the ability to coherently reverse time evolution.
arXiv Detail & Related papers (2021-02-23T15:29:08Z) - Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor.
We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
arXiv Detail & Related papers (2021-01-21T22:18:49Z) - Simulation of Thermal Relaxation in Spin Chemistry Systems on a Quantum
Computer Using Inherent Qubit Decoherence [53.20999552522241]
We seek to take advantage of qubit decoherence as a resource in simulating the behavior of real world quantum systems.
We present three methods for implementing the thermal relaxation.
We find excellent agreement between our results, experimental data, and the theoretical prediction.
arXiv Detail & Related papers (2020-01-03T11:48:11Z)
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.