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2016 ; 6
(ä): 25126
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Engineering integrated photonics for heralded quantum gates
#MMPMID27282928
Meany T
; Biggerstaff DN
; Broome MA
; Fedrizzi A
; Delanty M
; Steel MJ
; Gilchrist A
; Marshall GD
; White AG
; Withford MJ
Sci Rep
2016[Jun]; 6
(ä): 25126
PMID27282928
show ga
Scaling up linear-optics quantum computing will require multi-photon gates which
are compact, phase-stable, exhibit excellent quantum interference, and have
success heralded by the detection of ancillary photons. We investigate the
design, fabrication and characterisation of the optimal known gate scheme which
meets these requirements: the Knill controlled-Z gate, implemented in integrated
laser-written waveguide arrays. We show device performance to be less sensitive
to phase variations in the circuit than to small deviations in the coupler
reflectivity, which are expected given the tolerance values of the fabrication
method. The mode fidelity is also shown to be less sensitive to reflectivity and
phase errors than the process fidelity. Our best device achieves a fidelity of
0.931?±?0.001 with the ideal 4?×?4 unitary circuit and a process fidelity of
0.680?±?0.005 with the ideal computational-basis process.