Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.190401
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Funding
- KAKENHI from the Japan Society for the Promotion of Science [JP26287088]
- KAKENHI [JP15H05855]
- Photon Frontier Network Program from MEXT of Japan
- JSPS [JP16J03613]
- JSPS through Program for Leading Graduate Schools (ALPS)
- Grants-in-Aid for Scientific Research [26287088, 16J03613, 15H05855] Funding Source: KAKEN
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By investigating information flow between a general parity-time (PT-) symmetric non-Hermitian system and an environment, we find that the complete information retrieval from the environment can be achieved in the PT-unbroken phase, whereas no information can be retrieved in the PT-broken phase. The PT-transition point thus marks the reversible-irreversible criticality of information flow, around which many physical quantities such as the recurrence time and the distinguishability between quantum states exhibit power-law behavior. Moreover, by embedding a PT-symmetric system into a larger Hilbert space so that the entire system obeys unitary dynamics, we reveal that behind the information retrieval lies a hidden entangled partner protected by PT symmetry. Possible experimental situations are also discussed.
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