Quantum Cloning of Binary Coherent States - Optimal Transformations and Practical Limits
arXiv:1609.02136 · doi:10.1103/PhysRevA.96.042311
Abstract
The notions of qubits and coherent states correspond to different physical systems and are described by specific formalisms. Qubits are associated with a two-dimensional Hilbert space and can be illustrated on the Bloch sphere. In contrast, the underlying Hilbert space of coherent states is infinite-dimensional and the states are typically represented in phase space. For the particular case of binary coherent state alphabets these otherwise distinct formalisms can equally be applied. We capitalize this formal connection to analyse the properties of optimally cloned binary coherent states. Several practical and near-optimal cloning schemes are discussed and the associated fidelities are compared to the performance of the optimal cloner.
12 pages, 12 figures
References in corpus (7)
- Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receivers
- Demonstration of near-Optimal Discrimination of Optical Coherent States
- Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector
- Displacement receiver for phase-shift-keyed coherent states
- QPSK coherent state discrimination via a hybrid receiver
- A robust quantum receiver for phase shift keyed signals
- Symmetric M-ary phase discrimination using quantum-optical probe states