Paper as a Communications Medium

Wiseman, Nicholas

doi:10.1108/lhtn.2002.23919caf.002

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2002

DOI: 10.1108/lhtn.2002.23919caf.002

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Paper as a Communications Medium

Nicholas Wiseman¹

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“…Adaptive protocols are difficult to study [13][14][15][16][17][18] but a powerful tool can now be borrowed from the field of quantum communication. In this context, Ref.…”

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confidence: 99%

Ultimate Precision of Adaptive Noise Estimation

2017

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We consider the estimation of noise parameters in a quantum channel, assuming the most general strategy allowed by quantum mechanics. This is based on the exploitation of unlimited entanglement and arbitrary quantum operations, so that the channel inputs may be interactively updated. In this general scenario we draw a novel connection between quantum metrology and teleportation. In fact, for any teleportation-covariant channel (e.g., Pauli, erasure, or Gaussian channel), we find that adaptive noise estimation cannot beat the standard quantum limit, with the quantum Fisher information being determined by the channel's Choi matrix. As an example, we establish the ultimate precision for estimating excess noise in a thermal-loss channel which is crucial for quantum cryptography. Because our general methodology applies to any functional which is monotonic under trace-preserving maps, it can be applied to simplify other adaptive protocols, including those for quantum channel discrimination. Setting the ultimate limits for noise estimation and discrimination paves the way for exploring the boundaries of quantum sensing, imaging and tomography.

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“…Adaptive protocols are difficult to study [13][14][15][16][17][18] but a powerful tool can now be borrowed from the field of quantum communication. In this context, Ref.…”

mentioning

confidence: 99%

Ultimate Precision of Adaptive Noise Estimation

2017

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Paper as a Communications Medium

Cited by 1 publication

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Ultimate Precision of Adaptive Noise Estimation

Ultimate Precision of Adaptive Noise Estimation

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