Hybrid Quantum Repeater Protocol With Fast Local Processing

Abstract

We propose a hybrid quantum repeater protocol combining the advantages of continuous and discrete variables. The repeater is based on the previous work of Brask et al. [Phys. Rev. Lett. 105, 160501 (2010)] but we present two ways of improving this protocol. In the previous protocol entangled single-photon states are produced and grown into superpositions of coherent states, known as two-mode cat states. The entanglement is then distributed using homodyne detection. To improve the protocol, we replace the time-consuming non-local growth of cat states with local growth of single-mode cat states, eliminating the need for classical communication during growth. Entanglement is generated in subsequent connection processes. Furthermore the growth procedure is optimized. We review the main elements of the original protocol and present the two modifications. Finally the two protocols are compared and the modified protocol is shown to perform significantly better than the original protocol.

14 pages, 7 figures

References in corpus (20)

• The Quantum Internet
• Device-independent security of quantum cryptography against collective attacks
• Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
• Mapping photonic entanglement into and out of a quantum memory
• Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
• Experimental demonstration of a BDCZ quantum repeater node
• Universal Approach to Optimal Photon Storage in Atomic Media
• Heralded Entanglement between Atomic Ensembles: Preparation, Decoherence, and Scaling
• Towards high-speed optical quantum memories
• Multiplexed Memory-Insensitive Quantum Repeaters
• A millisecond quantum memory for scalable quantum networks
• Memory-built-in quantum teleportation with photonic and atomic qubits
• Mapping multiple photonic qubits into and out of one solid-state atomic ensemble
• Quantum memory for entangled two-mode squeezed states
• Robust and Efficient Quantum Repeaters with Atomic Ensembles and Linear Optics
• A fast and robust approach to long-distance quantum communication with atomic ensembles
• A Hybrid Long-Distance Entanglement Distribution Protocol
• Quantum repeaters with entangled coherent states
• Temporally multiplexed quantum repeaters with atomic gases
• Fast Entanglement Distribution with Atomic Ensembles and Fluorescent Detection

Cited by in corpus (4)

• Entanglement and teleportation between polarization and wave-like encodings of an optical qubit
• Fast simulation of bosonic qubits via Gaussian functions in phase space
• Conversion of Thermal Equilibrium States into Superpositions of Macroscopically Distinct States
• Entanglement of a pair of quantum emitters via continuous fluorescence measurements: a tutorial