Quantum Computers and Decoherence: Exorcising the Demon from the Machine

Details Quantum Computers and Decoherence: Exorcising the Demon from the Machine Quantum Computers and Decoherence: Exorcising the Demon from the Machine

2003-02-27

arxiv.org/abs/quant-ph/0302198v1

Proceedings of the SPIE, "Noise and Information in Nanoelectronics, Sensors, and Standards", Santa Fe, New Mexico, Vol. 5115,

Physics

Quantum Physics

15 pages, no figures. Invited contribution to the proceedings of the SPIE Conference on Fluctuations and Noise. Section 8 cont

Scientific paper

10.1117/12.488754

Decoherence is the main obstacle to the realization of quantum computers. Until recently it was thought that quantum error correcting codes are the only complete solution to the decoherence problem. Here we present an alternative that is based on a combination of a decoherence-free subspace encoding and the application of strong and fast pulses: ``encoded recoupling and decoupling'' (ERD). This alternative has the advantage of lower encoding overhead (as few as two physical qubits per logical qubit suffice), and direct application to a number of promising proposals for the experimental realization of quantum computers.

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