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| related topics |
| {energy, state, states} |
| {time, decoherence, evolution} |
| {entanglement, phys, rev} |
| {qubit, qubits, gate} |
| {spin, pulse, spins} |
| {classical, space, random} |
| {level, atom, field} |
| {cos, sin, state} |
| {time, wave, function} |
| {state, algorithm, problem} |
| {energy, gaussian, time} |
| {light, field, probe} |
| {cavity, atom, atoms} |
| {state, states, coherent} |
|
Decoherence induced by interacting quantum spin baths
Davide Rossini, Tommaso Calarco, Vittorio Giovannetti, Simone Montangero, Rosario Fazio
abstract: We study decoherence induced on a two-level system coupled to a
one-dimensional quantum spin chain. We consider the cases where the dynamics of
the chain is determined by the Ising, XY, or Heisenberg exchange Hamiltonian.
This model of quantum baths can be of fundamental importance for the
understanding of decoherence in open quantum systems, since it can be
experimentally engineered by using atoms in optical lattices. As an example,
here we show how to implement a pure dephasing model for a qubit system coupled
to an interacting spin bath. We provide results that go beyond the case of a
central spin coupled uniformly to all the spins of the bath, in particular
showing what happens when the bath enters different phases, or becomes
critical; we also study the dependence of the coherence loss on the number of
bath spins to which the system is coupled and we describe a
coupling-independent regime in which decoherence exhibits universal features,
irrespective of the system-environment coupling strength. Finally, we establish
a relation between decoherence and entanglement inside the bath. For the Ising
and the XY models we are able to give an exact expression for the decay of
coherences, while for the Heisenberg bath we resort to the numerical
time-dependent Density Matrix Renormalization Group.
- oai_identifier:
- oai:arXiv.org:quant-ph/0611242
- categories:
- quant-ph cond-mat.other
- comments:
- 18 pages, 20 figures
- doi:
- 10.1103/PhysRevA.75.032333
- arxiv_id:
- quant-ph/0611242
- journal_ref:
- Phys. Rev. A 75, 032333 (2007)
- created:
- 2006-11-23
Full article ▸
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