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EnglishQuantum 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. The role played by particle statistics in the protocol is also investigated.
Castellini, A., Lo Franco, R., Lami, L., Winter, A., Adesso, G., & Compagno, G. (2019). Indistinguishability-enabled coherence for quantum metrology. PHYSICAL REVIEW A, 100(1).
| Data di pubblicazione: | 2019 |
| Titolo: | Indistinguishability-enabled coherence for quantum metrology |
| Autori: | |
| Citazione: | Castellini, A., Lo Franco, R., Lami, L., Winter, A., Adesso, G., & Compagno, G. (2019). Indistinguishability-enabled coherence for quantum metrology. PHYSICAL REVIEW A, 100(1). |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevA.100.012308 |
| Abstract: | 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. The role played by particle statistics in the protocol is also investigated. |
| URL: | https://journals.aps.org/pra/abstract/10.1103/PhysRevA.100.012308 |
| Settore Scientifico Disciplinare: | Settore FIS/03 - Fisica Della Materia |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| PRA_Indistinguishability-enabled coherence for quantum metrology.pdf | Articolo principale | Versione Editoriale | Open Access Visualizza/Apri |
http://hdl.handle.net/10447/364707
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