Repeaters for Continuous Variable Quantum Communication

Abstract

Optical telecommunication is at the heart of today's internet and is currently enabled by the transmission of intense optical signals between remote locations. As we look to the future of telecommunication, quantum mechanics promise new ways to be able to transmit and process that information. Demonstrations of quantum key distribution and quantum teleportation using multi-photon states have been performed, but only over ranges limited to one hundred kilometers. To go beyond this, we need repeaters that are compatible with these quantum multi-photon continuous variables pulses. Here we present a design for a continuous variable quantum repeaters that can distribute entangled and pure two-mode squeezed states over arbitrarily long distances with a success probability that scales only polynomially with distance. The proposed quantum repeater is composed from several basic known building blocks such as non-Gaussian operations for entanglement distillation and an iterative Gaussification protocol (for retaining the Gaussian character of the final state), but complemented with a heralded non-Gaussian entanglement swapping protocol, which allows us to avoid extensive iterations of quantum Gaussification. We characterize the performance of this scheme in terms of key rates for quantum key distribution and show a secure key can be generated over thousands of kilometers.

References in corpus (13)

• The Quantum Internet
• General Benchmarks for Quantum Repeaters
• Fundamental Limits of Repeaterless Quantum Communications
• Secure Quantum Key Distribution
• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Quantum key distribution over 25 km with an all-fiber continuous-variable system
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Composable security proof for continuous-variable quantum key distribution with coherent states
• A de Finetti representation theorem for infinite dimensional quantum systems and applications to quantum cryptography
• System Design for a Long-Line Quantum Repeater
• Quantum Repeaters Using Continuous Variable Teleportation
• Could Gaussian regenerative stations act as quantum repeaters?
• Continuous-variable entanglement distillation and non-commutative central limit theorems

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• Continuous-Variable Measurement-Device-Independent Quantum Key Distribution in Free-Space Channels
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• Composable end-to-end security of Gaussian quantum networks with untrusted relays
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• Supporting multiple entanglement flows through a continuous-variable quantum repeater
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• Overcoming the repeaterless bound in continuous-variable quantum communication without quantum memories
• Continuous-variable quantum key distribution over multispan links employing phase-insensitive and phase-sensitive amplifiers
• Photonic Hybrid State Entanglement Swapping using Cat State Superpositions
• A Continuous Variable Quantum Switch
• Quantum Networks For Open Science
• Quantum communications in continuous variable systems
• Theoretical framework for enhancing or enabling cooling of a mechanical resonator via the anti-Stokes or Stokes interaction and zero-photon detection
• Continuous-Variable Multiplexed Quantum Repeater Networks
• Cat-state-like non-Gaussian entanglement in magnon systems
• Sharing classical secrets with continuous-variable entanglement: Composable security and network coding advantage