Quantum Communication with Coherent States and Linear Optics

Abstract

We introduce a general mapping for encoding quantum communication protocols involving pure states of multiple qubits, unitary transformations, and projective measurements into another set of protocols that employ coherent states of light in a superposition of optical modes, linear optics transformations and measurements with single-photon threshold detectors. This provides a general framework for transforming protocols in quantum communication into a form in which they can be implemented with current technology. We explore the similarity between properties of the original qubit protocols and the coherent-state protocols obtained from the mapping and make use of the mapping to construct new protocols in the context of quantum communication complexity and quantum digital signatures. Our results have the potential of bringing a wide class of quantum communication protocols closer to their experimental demonstration.

10 pages, 4 figures

References in corpus (3)

• Quantum Computing
• Gigahertz decoy quantum key distribution with 1 Mbit/s secure key rate
• Experimental quantum "Guess my Number" protocol using multiphoton entanglement

Cited by in corpus (6)

• Long-Distance Measurement-Device-Independent Multiparty Quantum Communication
• Multi-state discrimination below the quantum noise limit at the single-photon level
• Phase tracking for sub-shot-noise-limited receivers
• A robust hybrid receiver for binary phase-shift keying discrimination in the presence of phase noise
• Optimal quantum-programmable projective measurements with coherent states
• Channel-noise tracking for sub-shot-noise-limited receivers with neural networks