Surface code quantum communication

Details Surface code quantum communication Surface code quantum communication

2009-10-21

arxiv.org/abs/0910.4074v3

Phys. Rev. Lett. 104, 180503 (2010)

Physics

Quantum Physics

4 pages, 7 figures, 35% loss and 5% error sufficiently low to permit quantum data to be efficiently transmitted arbitrarily fa

Scientific paper

10.1103/PhysRevLett.104.180503

Quantum communication typically involves a linear chain of repeater stations, each capable of reliable local quantum computation and connected to their nearest neighbors by unreliable communication links. The communication rate in existing protocols is low as two-way classical communication is used. We show that, if Bell pairs are generated between neighboring stations with a probability of heralded success greater than 0.65 and fidelity greater than 0.96, two-way classical communication can be entirely avoided and quantum information can be sent over arbitrary distances with arbitrarily low error at a rate limited only by the local gate speed. The number of qubits per repeater scales logarithmically with the communication distance. If the probability of heralded success is less than 0.65 and Bell pairs between neighboring stations with fidelity no less than 0.92 are generated only every T_B seconds, the logarithmic resource scaling remains and the communication rate through N links is proportional to 1/(T_B log^2 N).

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