Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-05-17
Phys. Rev. B 60, 11404 (1999).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 6 figures
Scientific paper
10.1103/PhysRevB.60.11404
Quantum error correcting codes have been developed to protect a quantum computer from decoherence due to a noisy environment. In this paper, we present two methods for optimizing the physical implementation of such error correction schemes. First, we discuss an optimal quantum circuit implementation of the smallest error-correcting code (the three bit code). Quantum circuits are physically implemented by serial pulses, i.e. by switching on and off external parameters in the Hamiltonian one after another. In contrast to this, we introduce a new parallel switching method that allows faster gate operation by switching all external parameters simultaneously. These two methods are applied to electron spins in coupled quantum dots subject to a Heisenberg coupling H=J(t) S_1*S_2 which can generate the universal quantum gate `square-root-of-swap'. Using parallel pulses, the encoding for three-bit quantum error correction in a Heisenberg system can be accelerated by a factor of about two. We point out that parallel switching has potential applications for arbitrary quantum computer architectures.
Burkard Guido
DiVincenzo David P.
Loss Daniel
Smolin John A.
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