Near optimal discrimination of binary coherent signals via atom-light interaction

Abstract

We study the discrimination of weak coherent states of light with significant overlaps by nondestructive measurements on the light states through measuring atomic states that are entangled to the coherent states via dipole coupling. In this way, the problem of measuring and discriminating coherent light states is shifted to finding the appropriate atom-light interaction and atomic measurements. We show that this scheme allows us to attain a probability of error extremely close to the Helstrom bound, the ultimate quantum limit for discriminating binary quantum states, through the simple Jaynes-Cummings interaction between the field and ancilla with optimized light-atom coupling and projective measurements on the atomic states. Moreover, since the measurement is nondestructive on the light state, information that is not detected by one measurement can be extracted from the post-measurement light states through subsequent measurements.

11 pages, 9 figures

References in corpus (4)

• Strong atom-field coupling for Bose-Einstein condensates in an optical cavity on a chip
• A Single-Atom Quantum Memory
• Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receivers
• Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector

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• Two-sequential Conclusive Discrimination between Binary Coherent States via Indirect Measurements
• Indirect Measurement for Optimal Quantum Communication Enhanced by Binary Non-standard Coherent States
• Discrimination of Coherent States via Atom-Field Interaction without Rotation Wave Approximation
• Unambiguous state discrimination with intrinsic coherence
• Near-optimal coherent state discrimination via continuously labelled non-Gaussian measurements