Designing robust gate implementations for quantum-information processing
Abstract
Quantum-information processing systems are often operated through time-dependent controls; choosing these controls in a way that makes the resulting operation insensitive to variations in unknown or uncontrollable system parameters is an important prerequisite for obtaining high-fidelity gate operations. In this article we present a numerical method for constructing such robust control sequences for a quite general class of quantum-information processing systems. As an application of the method we have designed a robust implementation of a phase-shift operation central to rare-earth-metal quantum computing, an ensemble quantum computing system proposed by <article>Ohlsson et al. [Opt. Commun. 201, 71 (2002)]</article>. In this case the method has been used to obtain a high degree of insensitivity with respect to differences between ensemble members, but it is equally well suited for quantum computing with a single physical system.
- Publication:
-
Physical Review A
- Pub Date:
- April 2004
- DOI:
- 10.1103/PhysRevA.69.042323
- arXiv:
- arXiv:quant-ph/0312076
- Bibcode:
- 2004PhRvA..69d2323W
- Keywords:
-
- 03.67.Pp;
- 02.30.Yy;
- 32.80.Qk;
- Quantum error correction and other methods for protection against decoherence;
- Control theory;
- Coherent control of atomic interactions with photons;
- Quantum Physics
- E-Print:
- RevTeX 4, 6 pages, 3 figures