Unambiguous identification of coherent states II: Multiple resources

Abstract

We consider unambiguous identification of coherent states of electromagnetic field. In particular, we study possible generalizations of an optical setup proposed in M. Sedlák {\it et al.}, Phys. Rev. A {\bf 76}, 022326 (2007). We show how the unambiguous identification of coherent states can be performed in a general case when multiple copies of unknown and the reference states are available. We also investigate whether reference states after the measurement can be "recovered" and further used for subsequent unambiguous identification tasks. We show that in spite of the fact that the recovered reference states are disturbed by measurements they can be repeatedly used for unambiguous identifications. We analyze the role of various imperfections in preparation of the unknown and the reference coherent states on the performance of our unambiguous identification setup.

9 figures

References in corpus (11)

• Reference frames, superselection rules, and quantum information
• Measuring measurement
• Experimentally realizable quantum comparison of coherent states and its applications
• A universal programmable quantum state discriminator that is optimal for unambiguously distinguishing between unknown states
• Comparison of two unknown pure quantum states
• Optimal receiver for quantum cryptography with two coherent states
• Programmable discriminator of coherent states - experimental realization
• Unambiguous coherent state identification: Searching a quantum database
• Unambiguous comparison of ensembles of quantum states
• Quantum homodyne tomography with a priori constraints
• Coherent states engineering with linear optics: Possible and impossible tasks

Cited by in corpus (6)

• Quantum learning of coherent states
• Multi-copy programmable discrimination of general qubit states
• Programmable discrimination with an error margin
• An agnostic-Dolinar receiver for coherent states classification
• Optimal quantum discrimination of single-qubit unitary gates between two candidates
• Dealing with ignorance: universal discrimination, learning and quantum correlations