A prominent formulation of the uncertainty principle identifies the fundamental quantum feature that no particle may be prepared with certain outcomes for both position and momentum measurements. Often the statistical uncertainties are thereby measured in terms of entropies providing a clear operational interpretation in information theory and cryptography. Recently, entropic uncertainty relations have been used to show that the uncertainty can be reduced in the presence of entanglement and to prove security of quantum cryptographic tasks. However, much of this recent progress has been focused on observables with only a finite number of outcomes not including Heisenberg’s original setting of position and momentum observables. Here, we show entropic uncertainty relations for general observables with discrete but infinite or continuous spectrum that take into account the power of an entangled observer. As an illustration, we evaluate the uncertainty relations for position and momentum measurements, which is operationally significant in that it implies security of a quantum key distribution scheme based on homodyne detection of squeezed Gaussian states.
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December 2014
Research Article|
December 23 2014
Position-momentum uncertainty relations in the presence of quantum memory
Fabian Furrer;
Fabian Furrer
a)
1Department of Physics, Graduate School of Science,
University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Mario Berta;
Mario Berta
2
Institute for Quantum Information and Matter
, Caltech, Pasadena, California 91125, USA
3
Institute for Theoretical Physics
, ETH Zurich, Wolfgang-Pauli-Str. 27, 8093 Zürich, Switzerland
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Marco Tomamichel
;
Marco Tomamichel
4
School of Physics, The University of Sydney
, Sydney 2006, Australia
5
Centre for Quantum Technologies, National University of Singapore
, Singapore 117543, Singapore
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Volkher B. Scholz;
Volkher B. Scholz
3
Institute for Theoretical Physics
, ETH Zurich, Wolfgang-Pauli-Str. 27, 8093 Zürich, Switzerland
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Matthias Christandl
Matthias Christandl
3
Institute for Theoretical Physics
, ETH Zurich, Wolfgang-Pauli-Str. 27, 8093 Zürich, Switzerland
6Department of Mathematical Sciences,
University of Copenhagen
, Universitetsparken 5, 2100 Copenhagen, Denmark
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J. Math. Phys. 55, 122205 (2014)
Article history
Received:
October 12 2014
Accepted:
November 29 2014
Citation
Fabian Furrer, Mario Berta, Marco Tomamichel, Volkher B. Scholz, Matthias Christandl; Position-momentum uncertainty relations in the presence of quantum memory. J. Math. Phys. 1 December 2014; 55 (12): 122205. https://doi.org/10.1063/1.4903989
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