Energy-time entanglement preservation in plasmon-assisted light transmission.
We report on experimental evidence of the preservation of the energy-time entanglement of a pair of photons after a photon-plasmon-photon conversion. This preservation is observed in two different plasmon conversion experiments, namely, extraordinary optical transmission through subwavelength metallic hole arrays and long range surface plasmon propagation in metallic waveguides. Plasmons are shown to coherently exist at two different times separated by much more than their lifetimes. This kind of entanglement involving light and matter is expected to be useful for future processing and storing of quantum information.
Fasel
Sylvain
S
Group of Applied Physics, University of Geneva, CH-1211 Geneva 4, Switzerland. sylvain.fasel@physics.unige.ch
Robin
Franck
F
Moreno
Esteban
E
Erni
Daniel
D
Gisin
Nicolas
N
Zbinden
Hugo
H