Activation of indistinguishability-based quantum coherence for enhanced metrological applications with particle statistics imprint

Sun, Kai; Liu, Zhenghao; Wang, Yan; Hao, Ze-Yan; Xu, Xiao‐Ye; Xu, Jin‐Shi; Li, Chuan‐Feng; Guo, Guang‐Can; Castellini, Alessia; Lami, Ludovico; Winter, Andreas; Adesso, Gerardo; Franco, Rosario Lo

doi:10.1073/pnas.2119765119

Cited by 12 publications

(4 citation statements)

References 65 publications

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“…Thus, the parity-check detector ultimately discriminates the pure BS-transformed singlet component from the other ones, achieving the desired distillation. With a specific focus on coincidence measurements, i.e., on the detection of odd-parity terms, this mechanism is also at the heart of the technique employing the spatially localized operations and classical communication (sLOCC) operational framework [37,42,[47][48][49][50][51] to recover the quantum correlations initially present in a Bell singlet state subjected to the local action of noisy environments. [35,36,52] Finally, we emphasize that in order that the discussed interference effects properly occur, the different two-particle probability amplitudes must be indistinguishable when the qubits are collected.…”

Section: Discussionmentioning

confidence: 99%

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

2023

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This study proposes a procedure for the robust preparation of maximally entangled states of identical fermionic qubits, studying the role played by particle statistics in the process. The protocol exploits externally activated noisy channels to reset the system to a known state. The subsequent interference effects generated at a beam splitter result in a mixture of maximally entangled Bell states and NOON states. It also discusses how every maximally entangled state of two fermionic qubits distributed over two spatial modes can be obtained from one another by fermionic passive optical transformations. Using a pseudospin‐insensitive, non‐absorbing, parity check detector, the proposed technique is thus shown to deterministically prepare any arbitrary maximally entangled state of two identical fermions. These results extend recent findings related to bosonic qubits. Finally, it analyzes the performance of the protocol for both bosons and fermions when the externally activated noisy channels are not used and the two qubits undergo standard types of noise. The results supply further insights toward viable strategies for noise‐protected entanglement exploitable in quantum‐enhanced technologies.

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Section: Discussionmentioning

confidence: 99%

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

2023

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“…Finally, spatial indistinguishability of identical particles undergoing the sLOCC measurement has been shown to provide a useful resource of quantum coherence yielding an advantage in quantum metrology [40,41], whereas the endurance of quantum coherence within systems of indistinguishable particles in non-dissipative noisy quantum networks was demonstrated in [42].…”

Section: (B) Analysis and Possible Applicationsmentioning

confidence: 99%

Generating indistinguishability within identical particle systems: spatial deformations as quantum resource activators

Piccolini

Nosrati

Adesso

et al. 2023

Phil. Trans. R. Soc. A.

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Identical quantum subsystems can possess a property which does not have any classical counterpart: indistinguishability. As a long-debated phenomenon, identical particles’ indistinguishability has been shown to be at the heart of various fundamental physical results. When concerned with the spatial degree of freedom, identical constituents can be made indistinguishable by overlapping their spatial wave functions via appropriately defined spatial deformations . By the laws of quantum mechanics, any measurement designed to resolve a quantity which depends on the spatial degree of freedom only and performed on the regions of overlap is not able to assign the measured outcome to one specific particle within the system. The result is an entangled state where the measured property is shared between the identical constituents. In this work, we present a coherent formalization of the concept of deformation in a general N -particle scenario, together with a suitable measure of the degree of indistinguishability. We highlight the basic differences with non-identical particles scenarios and discuss the inherent role of spatial deformations as entanglement activators within the spatially localized operations and classical communication operational framework. This article is part of the theme issue ‘Identity, individuality and indistinguishability in physics and mathematics’.

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“…In photovoltaics, coherences can increase efficiency [16,22,42]. Quantum coherences are also essential to quantum sensing [43] and metrology [44,45]. The goal of this work is to investigate the generation of nonequilibrium quantum coherences, and their manifestation and roles in steady-state heat transport in pursuit of coherent control of thermal transport in devices, and a potential quantum advantage.…”

Section: Introductionmentioning

confidence: 99%

Quantum coherence-control of thermal energy transport: the V model as a case study

2022

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Whether genuine quantum effects, particularly quantum coherences, can offer an advantage to quantum devices is a topic of much interest. Here, we study a minimal model, the three-level V system coupled to two heat baths, and investigate the role of quantum coherences in heat transport in both the transient regime and in the nonequilibrium steady-state. In our model, energy is exchanged between the baths through two parallel pathways, which can be made distinct through the nondegeneracy of excited levels (energy splitting $\Delta$) and a control parameter $\alpha$, which adjusts the strength of one of the arms. Using a nonsecular quantum master equation of Redfield form, we succeed in deriving closed-form expressions for the quantum coherences and the heat current in the steady state limit for closely degenerate excited levels. By including three ingredients in our analysis: nonequilibrium baths, nondegeneracy of levels, and asymmetry of pathways, we show that quantum coherences are generated and sustained in the V model in the steady-state limit if three conditions, conjoining thermal and coherent effects are {\it simultaneously} met: (i) The two baths are held at different temperatures. (ii) Bath-induced pathways do not interfere destructively. (iii) Thermal rates do not mingle with the control parameter $\alpha$ to destroy interferences through an effective local equilibrium condition. Particularly, we find that coherences are maximized when the heat current is suppressed. Although we mainly focus on analytical results in the steady state limit, numerical simulations reveal that the transient behavior of coherences {\it contrasts} the steady-state limit: Large long-lived transient coherences vanish at steady state, while weak short-lived transient coherences survive, suggesting that different mechanisms are at play in these two regimes. Enhancing either the lifetime of transient coherences or their magnitude at steady state thus requires the control and optimization of different physical parameters.

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Activation of indistinguishability-based quantum coherence for enhanced metrological applications with particle statistics imprint

Cited by 12 publications

References 65 publications

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

Generating indistinguishability within identical particle systems: spatial deformations as quantum resource activators

Quantum coherence-control of thermal energy transport: the V model as a case study

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