|
| related topics |
| {time, decoherence, evolution} |
| {measurement, state, measurements} |
| {phase, path, phys} |
| {operator, operators, space} |
| {time, wave, function} |
| {equation, function, exp} |
| {level, atom, field} |
| {photon, photons, single} |
| {trap, ion, state} |
| {states, state, optimal} |
| {state, phys, rev} |
| {state, algorithm, problem} |
|
Dark evolution in a time-varying Zeno subspace
C. K. Law
abstract: We investigate the evolution of a quantum system under the influence of
sequential measurements. The measurement scheme distinguishes whether or not
the system is in a specified state $| {f_n}>$ at the $n^{\rm th}$ step, where
$| {f_n}>$ varies with $n$. Dark evolution corresponds to the situation when
all measurements give negative results. We show that dark evolution is unitary
in the continuous measurement limit. We derive the effective Hamiltonian, and
indicate how $| {f_n}>$ controls quantum state transport.
- oai_identifier:
- oai:arXiv.org:quant-ph/0405068
- categories:
- quant-ph
- comments:
- 4 pages
- doi:
- 10.1103/PhysRevA.70.034101
- arxiv_id:
- quant-ph/0405068
- created:
- 2004-05-13
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