Antibunched photons emitted by a quantum point contact out of equilibrium
arXiv:cond-mat/0405018 · doi:10.1103/PhysRevLett.93.096801
Abstract
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.
arXiv comment4 pages including 1 figure (to appear in PRL); [v2] added the antibunching condition for arbitrary shape of the response function
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