Multi-qubit compensation sequences
Journal Article (Journal Article)
The Hamiltonian control of n qubits requires precision control of both the strength and timing of interactions. Compensation pulses relax the precision requirements by reducing unknown but systematic errors. Using composite pulse techniques designed for single qubits, we show that systematic errors for n-qubit systems can be corrected to arbitrary accuracy given either two non-commuting control Hamiltonians with identical systematic errors or one error-free control Hamiltonian. We also examine composite pulses in the context of quantum computers controlled by two-qubit interactions. For quantum computers based on the XY interaction, single-qubit composite pulse sequences naturally correct systematic errors. For quantum computers based on the Heisenberg or exchange interaction, the composite pulse sequences reduce the logical single-qubit gate errors but increase the errors for logical two-qubit gates. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Full Text
Duke Authors
Cited Authors
- Tomita, Y; Merrill, JT; Brown, KR
Published Date
- January 19, 2010
Published In
Volume / Issue
- 12 /
International Standard Serial Number (ISSN)
- 1367-2630
Digital Object Identifier (DOI)
- 10.1088/1367-2630/12/1/015002
Citation Source
- Scopus