TY - JOUR
T1 - All-optical switching of photonic entanglement
AU - Hall, Matthew A.
AU - Altepeter, Joseph B.
AU - Kumar, Prem
PY - 2011/10
Y1 - 2011/10
N2 - Future quantum optical networks will require the ability to route entangled photons at high speeds, with minimal loss and added in-band noise, and-most importantly-without disturbing the photons' quantum state. Here we present an all-optical switch that fulfills these requirements and characterize its performance at the single-photon level. It exhibits a 200 ps switching window, 120 : 1 contrast, 1.5 dB loss, and induces no measurable degradation in the switched photons' entangled-state fidelity (<0.002). As a proof-of-principle demonstration of its capability, we use the switch to demultiplex a single quantum channel from a dual-channel, time-division-multiplexed entangled photon stream. Furthermore, because this type of switch couples the temporal and spatial degrees of freedom, it provides an important new tool with which to encode multiple-qubit quantum states on a single photon.
AB - Future quantum optical networks will require the ability to route entangled photons at high speeds, with minimal loss and added in-band noise, and-most importantly-without disturbing the photons' quantum state. Here we present an all-optical switch that fulfills these requirements and characterize its performance at the single-photon level. It exhibits a 200 ps switching window, 120 : 1 contrast, 1.5 dB loss, and induces no measurable degradation in the switched photons' entangled-state fidelity (<0.002). As a proof-of-principle demonstration of its capability, we use the switch to demultiplex a single quantum channel from a dual-channel, time-division-multiplexed entangled photon stream. Furthermore, because this type of switch couples the temporal and spatial degrees of freedom, it provides an important new tool with which to encode multiple-qubit quantum states on a single photon.
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U2 - 10.1088/1367-2630/13/10/105004
DO - 10.1088/1367-2630/13/10/105004
M3 - Article
AN - SCOPUS:80054848261
SN - 1367-2630
VL - 13
JO - New Journal of Physics
JF - New Journal of Physics
M1 - 105004
ER -