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Quantum error correction may delay, but also cause, entanglement sudden death
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0002-2082-9583
2008 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 77, no 5Article in journal (Refereed) Published
Abstract [en]

Dissipation may cause two initially entangled qubits to evolve into a separable state in a finite time. This behavior is called entanglement sudden death (ESD). We study to what extent quantum error correction can combat ESD. We find that in some cases quantum error correction can delay entanglement sudden death but in other cases quantum error correction may cause ESD for states that otherwise do not suffer from it. Our analysis also shows that fidelity may not be the best measure to compare the efficiency of different error correction codes since the fidelity is not directly coupled to a state's remaining entanglement.

Place, publisher, year, edition, pages
2008. Vol. 77, no 5
Keyword [en]
codes, decoherence, noise, disentanglement, channels, systems
Identifiers
URN: urn:nbn:se:kth:diva-17637DOI: 10.1103/PhysRevA.77.052307ISI: 000257023900045Scopus ID: 2-s2.0-43449117505OAI: oai:DiVA.org:kth-17637DiVA: diva2:335681
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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Björk, Gunnar

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