Measuring nothing

K. L. Oi, Daniel and Potocek, Vaclav and Jeffers, John (2012) Measuring nothing. arXiv.org.

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Abstract

Measurement is integral to quantum information processing and communication; it is how information encoded in the state of a system is transformed into classical signals for further use. In quantum optics, measurements are typically destructive, so that the state is not available afterwards for further steps - crucial for sequential measurement schemes. The development of practical methods for non-destructive measurements on optical fields is therefore an important topic for future practical quantum information processing systems. Here we show how to measure the presence or absence of the vacuum in a quantum optical field without destroying the state, implementing the ideal projections onto the respective subspaces. This not only enables sequential measurements, useful for quantum communication, but it can also be adapted to create novel states of light via bare raising and lowering operators.

  • Item type:Article
    ID code:43884
    Dates:
    Date
    Event
    12 July 2012
    Published
    Notes:7 pages, 4 figures
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:25 May 2013 10:20
    Last modified:08 Apr 2024 20:30
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/43884
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