Physics – Quantum Physics
Scientific paper
2006-10-13
Phys. Rev. A 75, 032310, 2007
Physics
Quantum Physics
19 pages, 2 figures, 3 tables; V2: references updated
Scientific paper
10.1103/PhysRevA.75.032310
We investigate the influence of memory errors in the quantum repeater scheme for long-range quantum communication. We show that the communication distance is limited in standard operation mode due to memory errors resulting from unavoidable waiting times for classical signals. We show how to overcome these limitations by (i) improving local memory, and (ii) introducing two new operational modes of the quantum repeater. In both operational modes, the repeater is run blindly, i.e. without waiting for classical signals to arrive. In the first scheme, entanglement purification protocols based on one-way classical communication are used allowing to communicate over arbitrary distances. However, the error thresholds for noise in local control operations are very stringent. The second scheme makes use of entanglement purification protocols with two-way classical communication and inherits the favorable error thresholds of the repeater run in standard mode. One can increase the possible communication distance by an order of magnitude with reasonable overhead in physical resources. We outline the architecture of a quantum repeater that can possibly ensure intercontinental quantum communication.
Briegel Hans J.
Dür Wolfgang
Hartmann Lee
Kraus Barbara
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