Experimental Application of Decoherence-Free Subspaces in an Optical Quantum-Computing Algorithm
Abstract
For a practical quantum computer to operate, it is essential to properly manage decoherence. One important technique for doing this is the use of “decoherence-free subspaces” (DFSs), which have recently been demonstrated. Here we present the first use of DFSs to improve the performance of a quantum algorithm. An optical implementation of the Deutsch-Jozsa algorithm can be made insensitive to a particular class of phase noise by encoding information in the appropriate subspaces; we observe a reduction of the error rate from 35% to 7%, essentially its value in the absence of noise.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2003
- DOI:
- 10.1103/PhysRevLett.91.187903
- arXiv:
- arXiv:quant-ph/0212134
- Bibcode:
- 2003PhRvL..91r7903M
- Keywords:
-
- 03.67.Pp;
- 03.65.Yz;
- 42.25.Hz;
- Quantum error correction and other methods for protection against decoherence;
- Decoherence;
- open systems;
- quantum statistical methods;
- Interference;
- Quantum Physics
- E-Print:
- 11 pages, 4 figures, submitted to PRL