Andreas Christ, Christine Silberhorn
Parametric down-conversion (PDC) is one of the most widely used methods to
create pure single-photon states for quantum information applications. However
little attention has been paid to higher-order photon components in the PDC
process, yet these ultimately limit the prospects of generating single-photons
of high quality. In this paper we investigate the impacts of higher-order
photon components and multiple frequency modes on the heralding rates and
single-photon fidelities. This enables us to determine the limits of PDC
sources for single-photon generation. Our results show that a perfectly
single-mode PDC source in conjunction with a photon-number resolving detector
is ultimately capable of creating single-photon Fock states with unit fidelity
and a maximal state creation probability of 25%. Hence an array of 17 switched
sources is required to build a deterministic (>99% emission probability) pure
single-photon source.
View original:
http://arxiv.org/abs/1111.4095
No comments:
Post a Comment