Detailed Information on Publication Record
2015
Process estimation in the presence of time-invariant memory effects
RYBÁR, Tomáš and Mário ZIMANBasic information
Original name
Process estimation in the presence of time-invariant memory effects
Authors
RYBÁR, Tomáš (703 Slovakia) and Mário ZIMAN (703 Slovakia, guarantor, belonging to the institution)
Edition
Phys. Rev. A, 2015, 1050-2947
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10301 Atomic, molecular and chemical physics
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 2.808 in 2014
RIV identification code
RIV/00216224:14330/15:00081696
Organization unit
Faculty of Informatics
UT WoS
000362888900002
Keywords in English
quantum memory - quantum communication - quantum estimation
Tags
International impact, Reviewed
Změněno: 29/4/2016 07:01, RNDr. Pavel Šmerk, Ph.D.
Abstract
V originále
Any repeated use of a fixed experimental instrument is subject to memory effects. We design an estimation method uncovering the details of the underlying interaction between the system and the internal memory without having any experimental access to memory degrees of freedom. In such case, by definition, any memoryless quantum process tomography (QPT) fails because the observed data sequences do not satisfy the elementary condition of statistical independence. However, we show that the randomness implemented in certain QPT schemes is sufficient to guarantee the emergence of observable “statistical” patterns containing complete information on the memory channels. We demonstrate the algorithm in detail for the case of qubit memory channels with two-dimensional memory. Interestingly, we find that for the arbitrary estimation method, the memory channels generated by controlled unitary interactions are indistinguishable from memoryless unitary channels.
Links
| GAP202/12/1142, research and development project |
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