Correlation approach to work extraction from finite quantum systems

@article{Giorgi2015CorrelationAT,
  title={Correlation approach to work extraction from finite quantum systems},
  author={Gian Luca Giorgi and Steve Campbell},
  journal={Journal of Physics B: Atomic, Molecular and Optical Physics},
  year={2015},
  volume={48}
}
  • G. GiorgiS. Campbell
  • Published 30 April 2014
  • Physics
  • Journal of Physics B: Atomic, Molecular and Optical Physics
Reversible work extraction from identical quantum systems via collective operations was shown to be possible even without producing entanglement among the sub-parts. Here, we show that implementing such global operations necessarily imply the creation of quantum correlations, as measured by quantum discord. We also reanalyze the conditions under which global transformations outperform local gates as far as maximal work extraction is considered by deriving a necessary and sufficient condition… 
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24 Citations
Background Citations
5
Methods Citations
1
Results Citations
1

24 Citations

Optimal Work Extraction and Thermodynamics of Quantum Measurements and Correlations.

This work focuses on the work that can be obtained by exploiting the correlations shared between the system of interest and an additional ancilla, where measurement backaction introduces a nontrivial thermodynamic tradeoff.

Trade-off Between Work and Correlations in Quantum Thermodynamics

The role of correlations in quantum thermodynamics is reviewed, with a particular focus on the conversion of work into correlations, and new insights are provided into the fundamental work cost of correlations and the existence of optimally correlating unitaries.

Trade-off Between Work and Correlations in Quantum Thermodynamics

Quantum thermodynamics and quantum information are two frameworks for employing quantum mechanical systems for practical tasks, exploiting genuine quantum features to obtain advantages with respect…

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For a bipartite state with equal local dimension d, we prove that one can obtain work gain under Landauer's erasure process on one party in identically and independently distributed (iid) limit when…

Quantum Coherence and Ergotropy.

This work identifies a coherent contribution to the ergotropy (the maximum amount of unitarily extractable work via cyclical variation of Hamiltonian parameters) and shows this by dividing the optimal transformation into an incoherent operation and a coherence extraction cycle.

Multipartite quantum and classical correlations in symmetric n-qubit mixed states

It is shown that the existence of symmetries greatly reduces the amount of free parameters to be optimized in order to find the optimal measurement that minimizes the conditional entropy in the discord calculation.

Local passivity and entanglement in shared quantum batteries

We identify the conditions for local passivity for shared quantum batteries with local Hamiltonians. For locally passive states of two-qubit batteries, we find the relation of their entanglement…

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In this paper, we consider a heat engines composed of two interactional qubits with spin-orbit interaction (Dzyaloshinskii–Moriya (DM)) subject to an external magnetic field, so that each qubit is…

Quantum Features and Signatures of Quantum Thermal Machines

The aim of this book chapter is to indicate how quantum phenomena are affecting the operation of microscopic thermal machines, such as engines and refrigerators. As converting heat to work is one of…

Quantacell: powerful charging of quantum batteries

It is demonstrated that the quantum advantage for power holds when, with cyclic operation in mind, initial and final states are required to be separable.

References

SHOWING 1-10 OF 50 REFERENCES

Entanglement generation is not necessary for optimal work extraction.

It is shown that there always exists a method to extract all possible work without creating any entanglement, at the price of generically requiring more operations (i.e., additional time).

Entanglement boost for extractable work from ensembles of quantum batteries.

  • R. AlickiM. Fannes
  • Physics
    Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2013
It is shown that entangling unitary controls extract in general more work than independent ones, and in the limit of a large number of copies one can reach the thermodynamical bound given by the variational principle for the free energy.

Thermodynamical approach to quantifying quantum correlations.

The amount of work which can be extracted from a heat bath using a bipartite state shared by two parties is considered and the work deficit is derived and provides a new paradigm for understanding quantum nonlocality.

Entanglement, discord, and the power of quantum computation

We show that the ability to create entanglement is necessary for execution of bipartite quantum gates even when they are applied to unentangled states and create no entanglement. Starting with a…

Distributing entanglement with separable states.

In this experiment, two spatially separated modes of an electromagnetic field get entangled by local operations, classical communication, and transmission of a correlated but separable mode between them and a protocol for entanglement distribution by a separable quantum system is experimentally demonstrated.

Experimental quantum computing without entanglement.

The results show that even fully separable, highly mixed, states can contain intrinsically quantum mechanical correlations and that these could offer a valuable resource for quantum information technologies.

Experimental entanglement distribution by separable states.

This work experimentally distribute entanglement and successfully proves that the transmitted light beam is indeed not entangled with the parties' local systems.

Genuine quantum and classical correlations in multipartite systems.

This work defines genuine total, quantum, and classical correlations in multipartite systems and shows that, for pure states of three qubits, both quantum and classical bipartite correlations obey a ladder ordering law fixed by two-body mutual informations.

Quantum discord: a measure of the quantumness of correlations.

This work shows that absence of entanglement does not imply classicality, and considers the vanishing of discord as a criterion for the preferred effectively classical states of a system, i.e., the pointer states.

Observing the operational significance of discord consumption

Entanglement is not the only type of quantum correlation. Quantum discord is a broader measure of such non-classical interactions. An experimental investigation now shows how quantum discord can be…