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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper IB_5_2

Quantum information in the presence of loss

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Abstract

To illustrate the loss problem I take the example of quantum metrology where for interferometric measurement of an optical phase θ, the fundamental limit or the standard quantum limit (SQL) Δθ ≥ 1/√n where n is the number of photons detected. In theory using entangled photons it is possible to beat the SQL and achieve the Heisenberg limit Δθ ≥ 1/n. However this involves detecting the photons in n-fold sets which implies losses will go as Ln while in the classical case photons are detected individually and n=1. As a result recent metrology experiments ‘beating the quantum limit’ actually only do so in the artificial case where losses are factored out.

© 2013 IEEE

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