Initialization of composite quantum systems into highly entangled states is usually a must to enable their use for quantum technologies. However, unavoidable noise in the preparation stage makes the system state mixed, hindering this goal. Here, we address this problem in the context of identical particle systems within the operational framework of spatially localized operations and classical communication (sLOCC). We define the entanglement of formation for an arbitrary state of two identical qubits. We then introduce an entropic measure of spatial indistinguishability as an information resource. Thanks to these tools we find that spatial indistinguishability, even partial, can be a property shielding nonlocal entanglement from preparation noise, independently of the exact shape of spatial wave functions. These results prove quantum indistinguishability is an inherent control for noise-free entanglement generation.

Farzam Nosrati, Alessia Castellini, Giuseppe Compagno, Rosario Lo Franco (2020). Robust entanglement preparation against noise by controlling spatial indistinguishability. NPJ QUANTUM INFORMATION, 6(1) [10.1038/s41534-020-0271-7].

Robust entanglement preparation against noise by controlling spatial indistinguishability

Farzam Nosrati
Membro del Collaboration Group
;
Alessia Castellini
Membro del Collaboration Group
;
Giuseppe Compagno
Membro del Collaboration Group
;
Rosario Lo Franco
Supervision
2020-01-01

Abstract

Initialization of composite quantum systems into highly entangled states is usually a must to enable their use for quantum technologies. However, unavoidable noise in the preparation stage makes the system state mixed, hindering this goal. Here, we address this problem in the context of identical particle systems within the operational framework of spatially localized operations and classical communication (sLOCC). We define the entanglement of formation for an arbitrary state of two identical qubits. We then introduce an entropic measure of spatial indistinguishability as an information resource. Thanks to these tools we find that spatial indistinguishability, even partial, can be a property shielding nonlocal entanglement from preparation noise, independently of the exact shape of spatial wave functions. These results prove quantum indistinguishability is an inherent control for noise-free entanglement generation.
Settore FIS/03 - Fisica Della Materia
https://www.nature.com/articles/s41534-020-0271-7
Farzam Nosrati, Alessia Castellini, Giuseppe Compagno, Rosario Lo Franco (2020). Robust entanglement preparation against noise by controlling spatial indistinguishability. NPJ QUANTUM INFORMATION, 6(1) [10.1038/s41534-020-0271-7].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/422442
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