All-photonic quantum repeaters

By Koji Azuma, Kiyoshi Tamaki, Hoi-Kwong Lo. Nature Communications, 2013

592 citations recorded by the source corpus.

Quantum communication holds promise for unconditionally secure transmission of secret messages and faithful transfer of unknown quantum states. Photons appear to be the medium of choice for quantum communication. Owing to photon losses, robust quantum communication over long lossy channels requires quantum repeaters. It is widely believed that a necessary and highly demanding requirement for quantum repeaters is the existence of matter quantum memories. Here we show that such a requirement is, in fact, unnecessary by introducing the concept of all-photonic quantum repeaters based on flying qubits. In particular, we present a protocol based on photonic cluster-state machine guns and a loss-tolerant measurement equipped with local high-speed active feedforwards. We show that, with such all-photonic quantum repeaters, the communication efficiency scales polynomially with the channel distance. Our result paves a new route towards quantum repeaters with efficient single-photon sources rather than matter quantum memories. Quantum repeaters are needed for long-distance quantum communication but it is thought that they require matter quantum memories. Azuma et al. introduce an all-photonic quantum repeater based on flying qubits that scales polynomially with the channel distance without the need for matter quantum memories.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/bd6b15f2b8cc4b54d0ecfee372f81ed3b8280b59

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Citations in the corpus

Deterministic generation of all-photonic quantum repeaters from solid-state emitters (2016, background): “[16]: (a) Top: Emitter B is connected to ancilla A with a CZ gate and pumped twice, creating photons 1 and 2.”
One-Way Quantum Repeater Based on Near-Deterministic Photon-Emitter Interfaces (2019, background): “[12] and the large overhead of single-photon sources for linear optics protocols [14] is circumvented.”
Practical challenges in quantum key distribution (2016, unknown): “148 Finally, the third approach is ground-to-satellite QKD.”
A link layer protocol for quantum networks (2019, methodology): “implementations of QECC are in very early stages [26, 27, 74]: to use a QECC for information traveling 5̃km, we would need to create highly entangled quantum states of many qubits, combined with quantum operations of extremely high precision [7].”
Why I am optimistic about the silicon-photonic route to quantum computing (2016, background): “It forms the basis of a recent quantum repeater proposal [64].”
Silicon Quantum Photonics (2015, background): “In many applications—including in a quantum repeater [130], QKD [121], and one-way quantum computing [131]—a”
Inside Quantum Repeaters (2015, methodology): “[70] developed all optical quantum repeaters by taking a time reversal of the DLCZ-like quantum repeater protocol.”
Quantum-dot based photonic quantum networks (2017, background): “quantum repeater protocols without the necessity of a matter-based quantum memory [73, 74].”
Optimal architectures for long distance quantum communication (2015, background): “Recently, there have been growing interest in all optical quantum repeaters 14,27,28 which does not require memory qubits.”
Advances in quantum cryptography (2019, unknown): “[644] K.”