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Two-qubit conditional phase gate in laser-excited semiconductor quantum dots using the quantum Zeno effect.
- Source :
-
Physical review letters [Phys Rev Lett] 2009 Jul 17; Vol. 103 (3), pp. 037401. Date of Electronic Publication: 2009 Jul 14. - Publication Year :
- 2009
-
Abstract
- We propose a scheme for a two-qubit conditional quantum Zeno phase gate for semiconductor quantum dots. The proposed system consists of two charged dots and one ancillary neutral dot driven by a laser pulse tuned to the exciton resonance. The primary decoherence mechanism is phonon-assisted exciton relaxation, which can be viewed as continuous monitoring by the environment. Because of the Zeno effect, a strong possibility of emission is sufficient to strongly modify the coherent dynamics, with negligible probability of actual emission. We solve analytically the master equation and simulate the dynamics of the system using a realistic set of parameters. In contrast to standard schemes, larger phonon relaxation rates increase the fidelity of the operations.
Details
- Language :
- English
- ISSN :
- 0031-9007
- Volume :
- 103
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 19659314
- Full Text :
- https://doi.org/10.1103/PhysRevLett.103.037401