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Physical Review X

ISSN: 2160-3308

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  • 2018

  • At the Limits of Criticality-Based Quantum Metrology: Apparent Super-Heisenberg Scaling Revisited

    M. Rams, P. Sierant, O. Dutta, P. Horodecki, J. Zakrzewski - Physical Review X - 2018
    We address the question of whether the super-Heisenberg scaling for quantum estimation is indeed realizable. We unify the results of two approaches. In the first one, the original system is compared with its copy rotated by the parameter-dependent dynamics. If the parameter is coupled to the one-body part of the Hamiltonian, the precision of its estimation is known to scale at most as N−1 (Heisenberg scaling) in terms of the number...
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  • 2017

  • Towards Resource Theory of Coherence in Distributed Scenarios

    A. Streltsov, S. Rana, M. Bera, M. Lewenstein - Physical Review X - 2017
    The search for a simple description of fundamental physical processes is an important part of quantum theory. One example for such an abstraction can be found in the distance lab paradigm: if two separated parties are connected via a classical channel, it is notoriously difficult to characterize all possible operations these parties can perform. This class of operations is widely known as local operations and classical communication....
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