Indistinguishability of Elementary Systems as a Resource for Quantum Information Processing

Franco, Rosario Lo; Compagno, G.

doi:10.1103/physrevlett.120.240403

Cited by 139 publications

(201 citation statements)

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“…The double slit and the beam splitter are classical objects. Similar ideas based on indistinguishability have been exploited in [57][58][59] for entanglement generation. larger than S th (β B ) for any initial inverse temperature β 0 such that |β 0 | < |β B | (equivalent to z(β 0 ) < z(β B )).…”

Section: Appendix B: Interaction Between the Two Confined Atomsmentioning

confidence: 99%

Energetic and entropic effects of bath-induced coherences

2019

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The unavoidable interaction of a quantum system with its surrounding (bath) is not always detrimental for quantum properties. For instance, under some specific conditions (that we identify as indistinguishability), a many-body system can gain internal coherences thanks to the interaction with its bath. The most famous consequence of this phenomenon is superradiance. Beyond that, the thermodynamic effects on the system of these bath-induced coherences have been mostly unexplored. We show here, for a simple and common system (a pair of two-level systems), that the energetic and entropic impacts can indeed be dramatic and diverse, including amplification of the action of the bath but also its mitigation. Our results can be tested experimentally. They suggest that bath-induced coherences can be harnessed to enhance thermodynamic tasks, opening up interesting perspectives for thermal machines, quantum battery charging, natural or artificial energy harvesting systems, and state preparation and protection.

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Section: Appendix B: Interaction Between the Two Confined Atomsmentioning

confidence: 99%

Energetic and entropic effects of bath-induced coherences

2019

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“…[35] and Ref. [32] in this septup). Supposing among N bosons n particles are in pseudospin up (↑) and (N − n) are in pseudospin down (↓), the total wave…”

Section: From Spatial Coherence To the Bipartite Entanglement Ofmentioning

confidence: 66%

Entanglement of identical particles and coherence in the first quantization language

Chin

Huh

2019

Phys. Rev. A

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We suggest a formalism to illustrate the entanglement of identical particles in the first quantization language (1QL). Our 1QL formalism enables one to exploit all the well-established quantum information tools to understand the indistinguishable ones, including the reduced density matrix and familiar entanglement measures. The rigorous quantitative relation between the amount of entanglement and the spatial coherence of particles is possible in this formalism. Our entanglement detection process is a generalization of the entanglement extraction protocol for identical particles with mode splitting proposed by Killoran et al. (2014).

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“…Our results make it clear that spatial overlap of identical particles plays a role not only in the context of entanglement [11,12,18,30] but also for another fundamental feature of quantum systems, such as coherence, with an impact in any coherence-based quantum information processes.…”

Section: E X I T S H a 1 _ B A S E 6 4 = " 2 N J E H 5 F T G Y K M E mentioning

confidence: 87%

“…Following the procedure to identify and quantify the useful entanglement between identical particles [18], in order to characterize the quantum coherence we here adopt a framework based on sLOCC, which consists in the identification of specific separate spatial regions to make single-particle and two-particle local measurements. In particular, we choose the basis B I = {|Lσ, Rτ ; σ, τ =↓, ↑}, where |L and |R are two states spatially localized in the separate regions L and R, respectively.…”

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confidence: 99%

Indistinguishability-enabled coherence for quantum metrology

et al. 2019

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Quantum coherence plays a fundamental and operational role in different areas of physics. A resource theory has been developed to characterize the coherence of distinguishable particles systems. Here we show that indistinguishability of identical particles is a source of coherence, even when they are independently prepared. In particular, under spatially local operations, states that are incoherent for distinguishable particles, can be coherent for indistinguishable particles under the same procedure. We present a phase discrimination protocol, in which we demonstrate the operational advantage of using two indistinguishable particles rather than distinguishable ones. The coherence due to the quantum indistinguishability significantly reduces the error probability of guessing the phase using the most general measurements. PACS numbers: 03.65.Ta, 03.67.-a, 03.67.Mn, 03.65.UdIntroduction. -Quantum coherence concerns the possibility to create a quantum state as a superposition of two or more different configurations. Recently, a resource theory of coherence has been proposed, in order to characterize, quantify and exploit coherence [1][2][3][4][5][6][7]. Chosen a reference basis, diagonal and non diagonal states in that basis are called incoherent (free) states and coherent (resource) states, respectively. The free operations to which we have access, in accordance with physical constraints imposed on the system, are the so-called incoherent operations. They cannot create coherence starting from incoherent states. It has been shown that coherence of a quantum state has an operational relevance in the implementation of phase discrimination protocols using distinguishable particles: the robustness of coherence quantifies not only the amount of coherence of a quantum state but also the advantage offered by its presence in a metrology protocol [3,8]. In the context of quantum thermodynamics, a link between the coherence of a quantum state and the extractable work has been identified [9], and very recently the role of quantum coherence as a resource for the non-equilibrium entropy production has been pinpointed [10].

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Indistinguishability of Elementary Systems as a Resource for Quantum Information Processing

Cited by 139 publications

References 50 publications

Energetic and entropic effects of bath-induced coherences

Energetic and entropic effects of bath-induced coherences

Entanglement of identical particles and coherence in the first quantization language

Indistinguishability-enabled coherence for quantum metrology

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