Frozen quantum coherence
We analyze under which dynamical conditions the coherence of an open quantum system is totally unaffected by noise. For a single qubit, specific measures of coherence are found to freeze under different conditions, with no general agreement between them. Conversely, for an N-qubit system with even N...
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American Physical Society
2015
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| Online Access: | http://eprints.nottingham.ac.uk/47178/ http://eprints.nottingham.ac.uk/47178/ http://eprints.nottingham.ac.uk/47178/ http://eprints.nottingham.ac.uk/47178/1/15PRL_114_210401.pdf |
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nottingham-471782017-10-14T17:01:56Z http://eprints.nottingham.ac.uk/47178/ Frozen quantum coherence Bromley, Thomas R. Cianciaruso, Marco Adesso, Gerardo We analyze under which dynamical conditions the coherence of an open quantum system is totally unaffected by noise. For a single qubit, specific measures of coherence are found to freeze under different conditions, with no general agreement between them. Conversely, for an N-qubit system with even N, we identify universal conditions in terms of initial states and local incoherent channels such that all bona fide distance-based coherence monotones are left invariant during the entire evolution. This finding also provides an insightful physical interpretation for the freezing phenomenon of quantum correlations beyond entanglement. We further obtain analytical results for distance-based measures of coherence in two-qubit states with maximally mixed marginals. American Physical Society 2015-05-27 Article PeerReviewed application/pdf en http://eprints.nottingham.ac.uk/47178/1/15PRL_114_210401.pdf Bromley, Thomas R. and Cianciaruso, Marco and Adesso, Gerardo (2015) Frozen quantum coherence. Physical Review Letters, 114 (21). 210401/1-210401/6. ISSN 1079-7114 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.210401 doi:10.1103/PhysRevLett.114.210401 doi:10.1103/PhysRevLett.114.210401 |
| repository_type |
Digital Repository |
| institution_category |
Local University |
| institution |
University of Nottingham Malaysia Campus |
| building |
Nottingham Research Data Repository |
| collection |
Online Access |
| language |
English |
| description |
We analyze under which dynamical conditions the coherence of an open quantum system is totally unaffected by noise. For a single qubit, specific measures of coherence are found to freeze under different conditions, with no general agreement between them. Conversely, for an N-qubit system with even N, we identify universal conditions in terms of initial states and local incoherent channels such that all bona fide distance-based coherence monotones are left invariant during the entire evolution. This finding also provides an insightful physical interpretation for the freezing phenomenon of quantum correlations beyond entanglement. We further obtain analytical results for distance-based measures of coherence in two-qubit states with maximally mixed marginals. |
| format |
Article |
| author |
Bromley, Thomas R. Cianciaruso, Marco Adesso, Gerardo |
| spellingShingle |
Bromley, Thomas R. Cianciaruso, Marco Adesso, Gerardo Frozen quantum coherence |
| author_facet |
Bromley, Thomas R. Cianciaruso, Marco Adesso, Gerardo |
| author_sort |
Bromley, Thomas R. |
| title |
Frozen quantum coherence |
| title_short |
Frozen quantum coherence |
| title_full |
Frozen quantum coherence |
| title_fullStr |
Frozen quantum coherence |
| title_full_unstemmed |
Frozen quantum coherence |
| title_sort |
frozen quantum coherence |
| publisher |
American Physical Society |
| publishDate |
2015 |
| url |
http://eprints.nottingham.ac.uk/47178/ http://eprints.nottingham.ac.uk/47178/ http://eprints.nottingham.ac.uk/47178/ http://eprints.nottingham.ac.uk/47178/1/15PRL_114_210401.pdf |
| first_indexed |
2018-09-06T13:51:26Z |
| last_indexed |
2018-09-06T13:51:26Z |
| _version_ |
1610866372663836672 |