Maintaining coherence in quantum computers
Abstract
The effects of the inevitable coupling to external degrees of freedom of a quantum computer are examined. It is found that for quantum calculations (in which the maintenance of coherence over a large number of states is important), not only must the coupling be small, but the time taken in the quantum calculation must be less than the thermal time scale ħ/kBT. For longer times the condition on the strength of the coupling to the external world becomes much more stringent.
- Publication:
-
Physical Review A
- Pub Date:
- February 1995
- DOI:
- 10.1103/PhysRevA.51.992
- arXiv:
- arXiv:hep-th/9406058
- Bibcode:
- 1995PhRvA..51..992U
- Keywords:
-
- 03.65.-w;
- Quantum mechanics;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory;
- Quantum Physics
- E-Print:
- 13 pages