Antibunched photons emitted by a quantum point contact out of equilibrium

Details Antibunched photons emitted by a quantum point contact out of equilibrium Antibunched photons emitted by a quantum point contact out of equilibrium

2004-05-03

arxiv.org/abs/cond-mat/0405018v2

Phys.Rev.Lett. 93, 096801 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages including 1 figure (to appear in PRL); [v2] added the antibunching condition for arbitrary shape of the response funct

Scientific paper

10.1103/PhysRevLett.93.096801

Motivated by the experimental search for "GHz nonclassical light", we identify the conditions under which current fluctuations in a narrow constriction generate sub-Poissonian radiation. Antibunched electrons generically produce bunched photons, because the same photon mode can be populated by electrons decaying independently from a range of initial energies. Photon antibunching becomes possible at frequencies close to the applied voltage V, when the initial energy range of a decaying electron is restricted. The condition for photon antibunching in a narrow frequency interval below V is derived in terms of the eigenvalues T_n of the transmission matrix. This condition is satisfied in a quantum point contact, where only a single T_n differs from 0 or 1. The photon statistics is then a superposition of binomial distributions.

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