Demonstration of a simple entangling optical gate and its use in bell-state analysis.
We demonstrate a new architecture for an optical entangling gate that is significantly simpler than previous realizations, using partially polarizing beam splitters so that only a single optical mode-matching condition is required. We demonstrate operation of a controlled-z gate in both continuous-wave and pulsed regimes of operation, fully characterizing it in each case using quantum process tomography. We also demonstrate a fully resolving, nondeterministic optical Bell-state analyzer based on this controlled-z gate. This new architecture is ideally suited to guided optics implementations of optical gates.
Langford
N K
NK
Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia.
Weinhold
T J
TJ
Prevedel
R
R
Resch
K J
KJ
Gilchrist
A
A
O'Brien
J L
JL
Pryde
G J
GJ
White
A G
AG