Alternative experimental ways to access entropy production

• URL: http://arxiv.org/abs/2012.13640v2
• Date: Fri, 7 May 2021 09:38:34 GMT
• Title: Alternative experimental ways to access entropy production
• Abstract summary: We compute the entropy production with six distinct expressions derived from different approaches to the system description and its evolution. Our results provide a unified view on the various meanings of irreversibility in quantum systems and pave the way to the measurement of entropy production beyond thermal frameworks.
• Score: 1.8632352842368947
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically derive and experimentally compare several different ways to access entropy production in a quantum process under feedback control. We focus on a bipartite quantum system realizing an autonomous Maxwell's demon scheme reported by Najera-Santos et al. [Phys.~Rev.~Research 2, 032025(R) (2020)], where information encoded in a demon is consumed to transfer heat from a cold qubit to a hot cavity. By measuring individual quantum trajectories of the joint demon-cavity-qubit system, we compute the entropy production with six distinct expressions derived from different approaches to the system description and its evolution. Each method uses a specific set of trajectories and data processing. Our results provide a unified view on the various meanings of irreversibility in quantum systems and pave the way to the measurement of entropy production beyond thermal frameworks.

Related papers

• Irreversibility of decorrelating processes: an experimental assessment in cavity QED [1.5455030879549676]
  We experimentally investigate the entropy production of forward-backward cycles containing different decorrelating processes.<n>We apply these processes to the entanglement of a two-level atom, realized with a circular Rydberg atom, and a light field of a high-quality microwave cavity.<n>Due to the quantum nature of the atom-cavity system, we find that, although standard, the maximum likelihood estimation method for the density matrix leads to spurious divergences of the entropy production.
  arXiv  Detail & Related papers  (2026-01-11T17:57:44Z)
• A novel scheme for modelling dissipation or thermalization in open quantum systems [0.0]
  We introduce a novel method for investigating dissipation (gain) and thermalization in an open quantum system. To demonstrate the efficiency and significance of the method, we apply it to some ubiquitous open quantum systems.
  arXiv  Detail & Related papers  (2024-04-16T05:20:30Z)
• Entropy production in the mesoscopic-leads formulation of quantum thermodynamics [0.0]
  entropy production of systems strongly coupled to thermal baths is a core problem of quantum thermodynamics and mesoscopic physics. Recently, the mesoscopic leads approach has emerged as a powerful method for studying such quantum systems strongly coupled to multiple thermal baths. We show numerically, that a system coupled to a single bath exhibits a thermal fixed point at the level of the embedding.
  arXiv  Detail & Related papers  (2023-12-19T19:00:04Z)
• Quantum Fisher Information for Different States and Processes in Quantum Chaotic Systems [77.34726150561087]
  We compute the quantum Fisher information (QFI) for both an energy eigenstate and a thermal density matrix. We compare our results with earlier results for a local unitary transformation.
  arXiv  Detail & Related papers  (2023-04-04T09:28:19Z)
• 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)
• Qubit thermodynamics far from equilibrium: two perspectives about the nature of heat and work in the quantum regime [68.8204255655161]
  We develop an alternative theoretical framework for the thermodynamic analysis of two-level systems. We observe the appearance of a new term of work, which represents the energy cost of rotating the Bloch vector in presence of the external field that defines the local Hamiltonian. In order to illustrate our findings we study, from both perspectives, matter-radiation interaction processes for two different systems.
  arXiv  Detail & Related papers  (2021-03-16T09:31:20Z)
• Catalytic Transformations of Pure Entangled States [62.997667081978825]
  Entanglement entropy is the von Neumann entropy of quantum entanglement of pure states. The relation between entanglement entropy and entanglement distillation has been known only for the setting, and the meaning of entanglement entropy in the single-copy regime has so far remained open. Our results imply that entanglement entropy quantifies the amount of entanglement available in a bipartite pure state to be used for quantum information processing, giving results an operational meaning also in entangled single-copy setup.
  arXiv  Detail & Related papers  (2021-02-22T16:05:01Z)
• Quantum process inference for a single qubit Maxwell's demon [0.0]
  We highlight the usage of quantum process matrices as a unified language for describing thermodynamic processes in the quantum regime. We experimentally demonstrate this in the context of a quantum Maxwell's demon, where two major quantities are commonly investigated. We develop the optimal feedback protocols for these two quantities and experimentally investigate them in a superconducting circuit QED setup.
  arXiv  Detail & Related papers  (2021-02-01T19:00:02Z)
• 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)
• Experimental assessment of entropy production in a continuously measured mechanical resonator [0.0]
  We report on the experimental inference of the entropy production rate for a continuously monitored mesoscopic quantum system. Our experiment embodies a significant step towards the demonstration of full-scale control of fundamental thermodynamic processes at the mesoscopic quantum scale.
  arXiv  Detail & Related papers  (2020-05-07T13:01:34Z)
• Entropy production in the quantum walk [62.997667081978825]
  We focus on the study of the discrete-time quantum walk on the line, from the entropy production perspective. We argue that the evolution of the coin can be modeled as an open two-level system that exchanges energy with the lattice at some effective temperature.
  arXiv  Detail & Related papers  (2020-04-09T23:18:29Z)

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.