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Threshold error penalty for fault-tolerant quantum computation with nearest neighbor communication

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8 Author(s)
Szkopek, T. ; Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA ; Boykin, P.O. ; Heng Fan ; Roychowdhury, V.P.
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The error threshold for fault-tolerant quantum computation with concatenated encoding of qubits is penalized by internal communication overhead. Many quantum computation proposals rely on nearest neighbor communication, which requires excess gate operations. For a qubit stripe with a width of L+1 physical qubits implementing L levels of concatenation, we find that the error threshold of 2.1×10-5 without any communication burden is reduced to 1.2×10-7 when gate errors are the dominant source of error. This ∼175× penalty in error threshold translates to an ∼13× penalty in the amplitude and timing of gate operation control pulses.

Published in:

Nanotechnology, IEEE Transactions on  (Volume:5 ,  Issue: 1 )

Date of Publication:

Jan. 2006

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