Experimental Validation of Enhanced Information Capacity by Quantum Switch in Accordance with Thermodynamic Laws

• URL: http://arxiv.org/abs/2406.01951v1
• Date: Tue, 4 Jun 2024 04:03:51 GMT
• Title: Experimental Validation of Enhanced Information Capacity by Quantum Switch in Accordance with Thermodynamic Laws
• Authors: Cheng Xi, Xiangjing Liu, Hongfeng Liu, Keyi Huang, Xinyue Long, Daniel Ebler, Xinfang Nie, Oscar Dahlsten, Dawei Lu,
• Abstract summary: We experimentally probe the interplay of the quantum switch with the laws of thermodynamics. We show how quantum switching channels can increase the capacity to communicate information. We show that the switch can be used to take a thermal state to a state that is not thermal, whilst consuming free energy associated with the coherence of a control system.
• Score: 1.0448076679597245
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We experimentally probe the interplay of the quantum switch with the laws of thermodynamics. The quantum switch places two channels in a superposition of orders and may be applied to thermalizing channels. Quantum-switching thermal channels has been shown to give apparent violations of the second law. Central to these apparent violations is how quantum switching channels can increase the capacity to communicate information. We experimentally show this increase and how it is consistent with the laws of thermodynamics, demonstrating how thermodynamic resources are consumed. We use a nuclear magnetic resonance approach with coherently controlled interactions of nuclear spin qubits. We verify an analytical upper bound on the increase in capacity for channels that preserve energy and thermal states, and demonstrate that the bound can be exceeded for an energy-altering channel. We show that the switch can be used to take a thermal state to a state that is not thermal, whilst consuming free energy associated with the coherence of a control system. The results show how the switch can be incorporated into quantum thermodynamics experiments as an additional resource.

Related papers

• Thermodynamic criteria for signaling in quantum channels [0.0]
  We study how the thermalising tendency of a quantum channel constrains its signaling power and vice versa.<n>We find that the signaling ability of a quantum channel is upper-bounded by its athermality preservation and lower-bounded by its athermality transmission.<n>We demonstrate this interplay for the example of the quantum switch, revealing an explicit trade-off between the signaling ability and athermality of the quantum channels it can implement.
  arXiv  Detail & Related papers  (2025-06-25T13:40:56Z)
• Fundamental limits on anomalous energy flows in correlated quantum systems [0.0]
  In classical thermodynamics energy always flows from the hotter system to the colder one. If these systems are initially correlated, the energy flow can reverse, making the cold system colder and the hot system hotter. This intriguing phenomenon is called anomalous energy flow'' and shows the importance of initial correlations in determining physical properties of thermodynamic systems.
  arXiv  Detail & Related papers  (2023-07-07T20:51:48Z)
• Thermodynamics of adiabatic quantum pumping in quantum dots [50.24983453990065]
  We consider adiabatic quantum pumping through a resonant level model, a single-level quantum dot connected to two fermionic leads. We develop a self-contained thermodynamic description of this model accounting for the variation of the energy level of the dot and the tunnelling rates with the thermal baths.
  arXiv  Detail & Related papers  (2023-06-14T16:29:18Z)
• Quantum coherence can be transformed into heat [11.45160925944536]
  The first law of thermodynamics partitions the change in energy of a system into two pieces, heat and work. Recent studies have shown if contribution of quantum coherence is considered to the change of internal energy of the system, the first law of thermodynamics can be extended to the quantum domain.
  arXiv  Detail & Related papers  (2022-12-31T13:34:58Z)
• 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)
• 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)
• Thermodynamics of quantum switch information capacity activation [0.7673339435080445]
  We address a new setting where the second law is under question: thermalizations in a quantum superposition of causal orders. This superposition has been shown to be associated with an increase in the communication capacity of the channels. We show how the information capacity increase is compatible with thermodynamics.
  arXiv  Detail & Related papers  (2022-05-16T00:59:15Z)
• Implementation of a two-stroke quantum heat engine with a collisional model [50.591267188664666]
  We put forth a quantum simulation of a stroboscopic two-stroke thermal engine in the IBMQ processor. The system consists of a quantum spin chain connected to two baths at their boundaries, prepared at different temperatures using the variational quantum thermalizer algorithm.
  arXiv  Detail & Related papers  (2022-03-25T16:55:08Z)
• Taking the temperature of a pure quantum state [55.41644538483948]
  Temperature is a deceptively simple concept that still raises deep questions at the forefront of quantum physics research. We propose a scheme to measure the temperature of such pure states through quantum interference.
  arXiv  Detail & Related papers  (2021-03-30T18:18:37Z)
• Probabilistically Violating the First Law of Thermodynamics in a Quantum Heat Engine [0.0]
  We show that in the presence of quantum fluctuations, the first law of thermodynamics may break down. This happens because quantum mechanics imposes constraints on the knowledge of heat and work. Our results imply that in the presence of quantum fluctuations, the first law of thermodynamics may not be applicable to individual experimental runs.
  arXiv  Detail & Related papers  (2021-02-02T09:23:21Z)
• Evolution of a Non-Hermitian Quantum Single-Molecule Junction at Constant Temperature [62.997667081978825]
  We present a theory for describing non-Hermitian quantum systems embedded in constant-temperature environments. We find that the combined action of probability losses and thermal fluctuations assists quantum transport through the molecular junction.
  arXiv  Detail & Related papers  (2021-01-21T14:33:34Z)
• Quantifying the quantum heat contribution from a driven superconducting circuit [0.0]
  We propose a two-reservoir setup to detect the quantum component in the heat flow exchanged by a coherently driven atom with its thermal environment. tuning the driving parameters switches on and off the quantum and classical contributions to the heat flows, enabling their independent characterization.
  arXiv  Detail & Related papers  (2020-01-28T14:38:32Z)

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.