Auxiliary-assisted stochastic energy extraction from quantum batteries

• URL: http://arxiv.org/abs/2307.16856v1
• Date: Mon, 31 Jul 2023 17:15:39 GMT
• Title: Auxiliary-assisted stochastic energy extraction from quantum batteries
• Authors: Paranjoy Chaki, Aparajita Bhattacharyya, Kornikar Sen, Ujjwal Sen
• Abstract summary: We discuss the idea of extracting energy from a quantum battery based on a projective measurement on an auxiliary system. We show that a non-zero entanglement present initially between the battery and the auxiliary can induce an even higher amount of energy extraction than for product initial states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We discuss the idea of extracting energy stochastically from a quantum battery, which is based on performing a projective measurement on an auxiliary system. The battery is initially connected to the auxiliary system and allowed to evolve unitarily. After some time, we execute a measurement on the auxiliary system and choose a particular outcome. The auxiliary is then traced out of the system, and the relevant state of the battery is the final state. We consider the product of the energy difference between the initial and final states with the probability of getting the measurement outcome that reduces to that final state. We define the maximum value of this quantity as the stochastically extractable energy. Restricting ourselves to a particular uncountable set of states, we find that stochastically extractable energy is always higher than the maximum energy that can be extracted from the battery by applying unitary operations, even if the initial auxiliary-battery state is a product. We show that a non-zero entanglement present initially between the battery and the auxiliary can induce an even higher amount of stochastic energy extraction than that for product initial states. Further, the set of states for which stochastically extractable energy is zero is determined for all product initial states and found to only consist of a single state, viz., the ground state.

Related papers

• Quantum harvester enables energy transfer without randomness transfer or dissipation [3.1209829091833874]
  Given a partly random energy source, is it possible to extract the energy without transferring randomness or accepting another thermodynamical cost? We describe scenarios and protocols where in principle energy is extracted from a field with randomness but without any randomness being transferred, and without energy dissipation.
  arXiv  Detail & Related papers  (2024-06-12T10:12:38Z)
• Second Law of Entanglement Manipulation with Entanglement Battery [41.94295877935867]
  A central question since the beginning of quantum information science is how two distant parties can convert one entangled state into another. It has been conjectured that entangled state transformations could be executed reversibly in an regime, mirroring the nature of Carnot cycles in classical thermodynamics. We investigate the concept of an entanglement battery, an auxiliary quantum system that facilitates quantum state transformations without a net loss of entanglement.
  arXiv  Detail & Related papers  (2024-05-17T07:55:04Z)
• Measurement-Device-Independent Detection of Beyond-Quantum State [53.64687146666141]
  We propose a measurement-device-independent (MDI) test for beyond-quantum state detection. We discuss the importance of tomographic completeness of the input sets to the detection.
  arXiv  Detail & Related papers  (2023-12-11T06:40:13Z)
• Observation of a finite-energy phase transition in a one-dimensional quantum simulator [39.899531336700136]
  We show the first experimental demonstration of a finite-energy phase transition in 1D. By preparing initial states with different energies in a 1D trapped-ion quantum simulator, we study the finite-energy phase diagram of a long-range interacting quantum system.
  arXiv  Detail & Related papers  (2023-10-30T18:00:01Z)
• Calculating the many-body density of states on a digital quantum computer [58.720142291102135]
  We implement a quantum algorithm to perform an estimation of the density of states on a digital quantum computer. We use our algorithm to estimate the density of states of a non-integrable Hamiltonian on the Quantinuum H1-1 trapped ion chip for a controlled register of 18bits.
  arXiv  Detail & Related papers  (2023-03-23T17:46:28Z)
• Adiabatic amplification of the harmonic oscillator energy when the frequency passes through zero [77.34726150561087]
  After a single frequency passage through zero value, the famous adiabatic invariant ratio of energy to frequency is reestablished again. The dependence on the initial state disappears after averaging over phases of initial states with the same energy. The original Born-Fock theorem does not work after the frequency passes through zero.
  arXiv  Detail & Related papers  (2023-03-15T01:18:55Z)
• Beneficial and detrimental entanglement for quantum battery charging [0.0]
  We assess the potential advantage of using highly entangled quantum states between the initial and final states of the charging protocol. We show that the quantum state advantage of battery charging, defined as the power obtainable for given quantum speed limit and battery energy gap, is not an entanglement monotone.
  arXiv  Detail & Related papers  (2023-03-14T12:27:46Z)
• The battery capacity of energy-storing quantum systems [6.09656856771409]
  The capacity of a quantum battery can be directly linked with the entropy of the battery state. The capacity of a quantum battery can be directly linked with measures of coherence and entanglement.
  arXiv  Detail & Related papers  (2023-02-20T11:06:43Z)
• Charging by quantum measurement [0.0]
  We propose a quantum charging scheme fueled by measurements on ancillary qubits serving as disposable chargers. A stream of identical qubits are sequentially coupled to a quantum battery of $N+1$ levels and measured by projective operations.
  arXiv  Detail & Related papers  (2022-09-28T06:55:43Z)
• Excited states from eigenvector continuation: the anharmonic oscillator [58.720142291102135]
  Eigenvector continuation (EC) has attracted a lot attention in nuclear structure and reactions as a variational resummation tool for many-body expansions. This work is dedicated to a detailed understanding of the emergence of excited states from the eigenvector continuation approach.
  arXiv  Detail & Related papers  (2021-08-05T19:28:25Z)
• Optimal state for a Tavis-Cummings quantum battery via the Bethe ansatz method [3.772651958513186]
  We find that the stored energy and the average charging power of the T-C quantum battery are closely related to the probability distribution of the optical field initial state in the number states. We find that the maximum stored energy and the maximum average charging power of the T-C quantum battery are proportional to the initial average photon number.
  arXiv  Detail & Related papers  (2021-07-12T08:12:11Z)

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.