Proof-of-Principle Direct Measurement of Particle Statistical Phase

Wang, Yan; Piccolini, Matteo; Hao, Ze-Yan; Liu, Zhenghao; Sun, Kai; Xu, Jin‐Shi; Li, Chuan‐Feng; Guo, Guang‐Can; Morandotti, Roberto; Franco, Rosario Lo

doi:10.1103/physrevapplied.18.064024

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…Depending on the input state, a setup can be assembled where the optical paths of the photons remain detached along their travel until they reach the detection regions where the photons eventually spatially overlap. In such a scenario, two beamsplitters independently distribute each particle wave packet towards two remote operational sites [8,61] in such a way that the particles are then indistinguishable for the final local detectors. The sLOCC measurement is then performed and the entanglement gets distilled.…”

Section: Discussionmentioning

confidence: 99%

“…The sLOCC measurement is then performed and the entanglement gets distilled. These optical experimental settings can also simulate different particle statistics [61,64,65], such as fermions and anyons. The above apparatuses are then well suited to design experiments which realize the indistinguishability-assisted entanglement distillation not only for bosonic qubits via photons but also for simulated fermionic particles.…”

Section: Discussionmentioning

confidence: 99%

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Indistinguishability-assisted two-qubit entanglement distillation

Nosrati,

Bellomo,

De Chiara

et al. 2024

Quantum Sci. Technol.

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Production of quantum states exhibiting a high degree of entanglement out of noisy conditions is one of the main goals of quantum information science. Here, we provide a conditional yet efficient entanglement distillation method which functions within the framework of spatially localized operations and classical communication. This method exploits indistinguishability effects due to the spatial overlap between two identical qubits in distinct sites and encompasses particle statistics imprint. We derive the general conditions for the maximum entanglement distillation out of mixed states. As applications, we give a thorough description of distilled entanglement and associated success probability starting from typical noisy states, such as thermal Gibbs states and Werner states. The influence of local temperatures and of noise parameter is discussed, respectively, in these two cases. The proposed scheme paves the way towards quantum repeaters in composite networks made of controllable identical quantum particles.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Indistinguishability-assisted two-qubit entanglement distillation

Nosrati,

Bellomo,

De Chiara

et al. 2024

Quantum Sci. Technol.

Self Cite

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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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“…Thanks to its reliance on spatial indistinguishability, the sLOCC process allows to avoid such a difficulty by letting θ naturally emerge. Exploiting this effect, in [39], the authors designed and experimentally implemented a photonic set up capable of directly measuring the exchange phase of two real bosons and of simulated fermions and anyons by applying interferometry to the sLOCC-produced state of equation (5.4). Remarkably, the introduced theoretical set up is general and could be suitably adapted to directly measure the exchange phase of even real fermions and anyons.…”

Section: Accessing Quantum Indistinguishability Resources: the Slocc ...mentioning

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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Proof-of-Principle Direct Measurement of Particle Statistical Phase

Cited by 6 publications

References 49 publications

Indistinguishability-assisted two-qubit entanglement distillation

Indistinguishability-assisted two-qubit entanglement distillation

Robust Engineering of Maximally Entangled States by Identical Particle Interferometry

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

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