Demonstration of a quantum controlled-NOT gate in the telecommunications band.
We present the first quantum controlled-not (cnot) gate realized using a fiber-based indistinguishable photon-pair source in the 1.55 microm telecommunications band. Using this free-space cnot gate, all four Bell states are produced and fully characterized by performing quantum-state tomography, demonstrating the gate's unambiguous entangling capability and high fidelity. Telecom-band operation makes this cnot gate particularly suitable for quantum-information-processing tasks that are at the interface of quantum communication and linear optical quantum computing.
Center for Photonic Communication and Computing, EECS Department, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3118, USA.
Jun
J
Chen
Joseph B
JB
Altepeter
Milja
M
Medic
Kim Fook
KF
Lee
Burc
B
Gokden
Robert H
RH
Hadfield
Sae Woo
SW
Nam
Prem
P
Kumar