Quantum computing in a Spin ordered phase

Дата и время публикации : 2001-02-01T16:04:15Z

Авторы публикации и институты :
F. de Pasquale (University “La Sapienza”, Rome Italy, INFM section of Rome)
S. M. Giampaolo (University “La Sapienza”, Rome Italy)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 9 pages, 0 figures
Первичная категория: cond-mat.stat-mech

Все категории : cond-mat.stat-mech

Краткий обзор статьи: We show that quantum computation can be performed in a system at thermal equilibrium if a spontaneous symmetry breaking occurs. The computing process is associated to the time evolution of the statistical average of the qubit coherence operator. This average defines logical states which evolve under the action of impulsive gate perturbations. Non trivial quantum coherence properties appear in the ordered phase characterized by a spontaneous symmetry breaking. Qubits are associated to spins and interaction with the lattice vibrations is approximated by an effective spin-spin interaction. A finite decoherence time is obtained only if spin correlations are taken into account in the framework of the Ising model as corrections to the Mean Field approximation. Decoherence is slowed down as the order parameter saturates.

Category: Physics