|
related topics |
{time, decoherence, evolution} |
{cavity, atom, atoms} |
{light, field, probe} |
{level, atom, field} |
{temperature, thermal, energy} |
{time, wave, function} |
{photon, photons, single} |
{spin, pulse, spins} |
{state, states, coherent} |
{wave, scattering, interference} |
{cos, sin, state} |
{energy, state, states} |
|
Influence of pure-dephasing by phonons on exciton-photon interfaces:
Quantum microscopic theory
Kunihiro Kojima, Akihisa Tomita
abstract: We have developed a full quantum microscopic theory to analyze the time
evolution of transversal and longitudinal components of an exciton-single
photon system coupled to bulk acoustic phonons. These components are subjected
to two decay processes. One is radiative relaxation and the other is
pure-dephasing due to exciton-phonon interaction. The former results in a decay
with an exponent linear to time, while the latter causes a faster initial decay
than the radiative decay. We analyzed the dependence of the components on the
duration of the input one-photon pulse, temperature, and radiative relaxation
rates. Such a quantitative analysis is important for the developments of
atom-photon interfaces which enable coherent transfer of quantum information
between photons and atomic systems. We found that, for a GaAs spherical quantum
dot in which the exciton interacts with bulk phonons, the maximal probability
of the excited state can be increased up to 75 %. This probability can be
considered as the efficiency for quantum information transfer from photon to
exciton.
- oai_identifier:
- oai:arXiv.org:quant-ph/0702198
- categories:
- quant-ph
- comments:
- 9pages, 5figures
- doi:
- 10.1103/PhysRevB.73.195312
- arxiv_id:
- quant-ph/0702198
- journal_ref:
- Phys. Rev. B 73, 195312 (2006)
- created:
- 2007-02-21
Full article ▸
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