Unlearning quantum information

Oi, Daniel (2014) Unlearning quantum information. European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics, 68. 259. ISSN 1434-6060 (https://doi.org/10.1140/epjd/e2014-50429-3)

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Abstract

Measurement can drive quantum dynamics, for example in ancilla driven quantum computation where unitary evolution is generated by measurements that extract no information. Where a measurement does reveal some information about the system, it may sometimes be possible to “unlearn” this information and restore unitary evolution through subsequent measurements. Here we analyse two methods of quantum “unlearning” and present a simplified proof of the bound on the probability of successfully applying the required correction operators. The probability of successful recovery is inversely related to the ability of the initial measurement to exclude the possibility of a state. As a consequence there exist unrecoverable measurements that provide little information gain.

ORCID iDs

Oi, Daniel ORCID logoORCID: https://orcid.org/0000-0003-0965-9509;
  • Item type:Article
    ID code:49382
    Dates:
    Date
    Event
    September 2014
    Published
    22 July 2014
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:26 Sep 2014 10:49
    Last modified:11 Nov 2024 10:47
    URI:https://strathprints.strath.ac.uk/id/eprint/49382
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