Physics – Quantum Physics
Scientific paper
1996-04-25
Physics
Quantum Physics
15 pages, postscript only, figures also available at http://feynman.stanford.edu/qcomp/
Scientific paper
The construction of large, coherent quantum systems necessary for quantum computation remains an entreating but elusive goal, due to the ubiquitous nature of decoherence. Recent progress in quantum error correction schemes have given new hope to this field, but thus far, the codes presented in the literature assume a restricted number of errors and error free encoding, decoding, and measurement. We investigate a specific scenario without these assumptions; in particular, we evaluate a scheme to preserve a single quantum bit against phase damping using a three-qubit encoding based on Shor. By applying a new formalism which gives simple operators for decoherence and noisy logic gates, we find the fidelity of the stored qubit as a function of time, including decoherence which occurs not only during storage but also during processing. We generalize our results to include any source of error, and derive an upper limit on the allowable decoherence per timestep. Physically, our results suggest the feasibility of engineering artificial metastable states through repeated error correction.
Chuang Isaac L.
Yamamoto Yoshihisa
No associations
LandOfFree
The Persistent Quantum Bit does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Persistent Quantum Bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Persistent Quantum Bit will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-485535