Cooling limits of coherent refrigerators

• URL: http://arxiv.org/abs/2410.18201v1
• Date: Wed, 23 Oct 2024 18:09:13 GMT
• Title: Cooling limits of coherent refrigerators
• Authors: Rodolfo R. Soldati, Durga B. R. Dasari, Jörg Wrachtrup, Eric Lutz,
• Abstract summary: We show that quantum systems can be cooled below existing incoherent cooling bounds by employing coherent virtual qubits. We derive universal coherent cooling limits and introduce specific protocols to reach them.
• Score: 0.0
• License:
• Abstract: Refrigeration limits are of fundamental and practical importance. We here show that quantum systems can be cooled below existing incoherent cooling bounds by employing coherent virtual qubits, even if the amount of coherence is incompletely known. Virtual subsystems, that do not necessarily correspond to a natural eigensubspace of a system, are a key conceptual tool in quantum information science and quantum thermodynamics. We derive universal coherent cooling limits and introduce specific protocols to reach them. As an illustration, we propose a generalized algorithmic cooling protocol that outperforms its current incoherent counterpart. Our results provide a general framework to investigate the performance of coherent refrigeration processes.

Related papers

• Local Purity Distillation in Quantum Systems: Exploring the Complementarity Between Purity and Entanglement [41.94295877935867]
  We introduce and develop the framework of Gibbs-preserving local operations and classical communication. We focus on systems with fully degenerate local Hamiltonians, where local cooling aligns with the extraction of local purity. Our findings open doors to various practical applications, including techniques for entanglement detection and estimation.
  arXiv  Detail & Related papers  (2023-11-20T14:58:31Z)
• Quantum Thermal State Preparation [39.91303506884272]
  We introduce simple continuous-time quantum Gibbs samplers for simulating quantum master equations. We construct the first provably accurate and efficient algorithm for preparing certain purified Gibbs states. Our algorithms' costs have a provable dependence on temperature, accuracy, and the mixing time.
  arXiv  Detail & Related papers  (2023-03-31T17:29:56Z)
• Floquet's Refrigerator: Conformal Cooling in Driven Quantum Critical Systems [0.0]
  We propose a general method of cooling, periodic driving generated by spatially deformed Hamiltonians. We study it in general one-dimensional quantum critical systems described by a conformal field theory.
  arXiv  Detail & Related papers  (2022-10-31T18:00:10Z)
• Gauge Quantum Thermodynamics of Time-local non-Markovian Evolutions [77.34726150561087]
  We deal with a generic time-local non-Markovian master equation. We define current and power to be process-dependent as in classical thermodynamics. Applying the theory to quantum thermal engines, we show that gauge transformations can change the machine efficiency.
  arXiv  Detail & Related papers  (2022-04-06T17:59:15Z)
• Fast Thermalization from the Eigenstate Thermalization Hypothesis [69.68937033275746]
  Eigenstate Thermalization Hypothesis (ETH) has played a major role in understanding thermodynamic phenomena in closed quantum systems. This paper establishes a rigorous link between ETH and fast thermalization to the global Gibbs state. Our results explain finite-time thermalization in chaotic open quantum systems.
  arXiv  Detail & Related papers  (2021-12-14T18:48:31Z)
• Breaking the limits of purification: Postselection enhances heat-bath algorithmic cooling [0.0]
  Quantum technologies require pure states, which are often generated by extreme refrigeration. Heat-bath algorithmic cooling is the theoretically optimal refrigeration technique. We show how to surpass this hitherto-optimal technique by taking advantage of a single binary-outcome measurement.
  arXiv  Detail & Related papers  (2021-08-19T18:00:01Z)
• 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)
• Coherences and the thermodynamic uncertainty relation: Insights from quantum absorption refrigerators [6.211723927647019]
  We examine the interplay of quantum system coherences and heat current fluctuations on the validity of the thermodynamics uncertainty relation in the quantum regime. Our results indicate that fluctuations necessitate consideration when assessing the performance of quantum coherent thermal machines.
  arXiv  Detail & Related papers  (2020-11-30T03:15:27Z)
• Few-qubit quantum refrigerator for cooling a multi-qubit system [0.0]
  We consider a central qubit coupled to $N$ ancilla qubits in a so-called spin-star model as our quantum refrigerator. The colder central qubit is then proposed to be used as the refrigerant interface to cool down general quantum many-qubit systems.
  arXiv  Detail & Related papers  (2020-11-27T19:25:23Z)
• Exponential improvement for quantum cooling through finite-memory effects [0.0]
  We study the effects of memory on quantum cooling. For qubits, our bound coincides with that of heat-bath algorithmic cooling. We describe the adaptive step-wise optimal protocol that outperforms all standard procedures.
  arXiv  Detail & Related papers  (2020-04-01T10:29:10Z)
• Algorithmic Cooling of Nuclear Spin Pairs using a Long-Lived Singlet State [48.7576911714538]
  We show that significant cooling is achieved on an ensemble of spin-pair systems by exploiting the long-lived nuclear singlet state. This is the first demonstration of algorithmic cooling using a quantum superposition state.
  arXiv  Detail & Related papers  (2019-12-31T09:57:03Z)

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.