Suppression of population transport and controlof exciton distributions by entangled photons

摘要

Entangled photons provide an important tool for secure quantum communication, computingand lithography. Low intensity requirements for multi-photon processes make them idealysuited for minimizing damage in imaging applications. Here we show how their uniquetemporal and spectral features may be used in nonlinear spectroscopy to reveal properties ofmultiexcitons in chromophore aggregates. Simulations demostrate that they provide uniquecontrol tools for two-exciton states in the bacterial reaction centre of Blastochloris viridis.Population transport in the intermediate single-exciton manifold may be suppressed by theabsorption of photon pairs with short entanglement time, thus allowing the manipulation ofthe distribution of two-exciton states. The quantum nature of the light is essential forachieving this degree of control, which cannot be reproduced by stochastic or chirped light.Classical light is fundamentally limited by the frequency-time uncertainty, whereas entangledphotons have independent temporal and spectral characteristics not subjected to thisuncertainty.