Stability thresholds and calculation techniques for fast entangling gates on trapped ions
Date
2016-01-13
Authors
Bentley, C D B
Taylor, R L
Carvalho, A R R
Hope, J J
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American Physical Society
Abstract
Fast entangling gates have been proposed for trapped ions that are orders of
magnitude faster than current implementations. We present here a detailed
analysis of the challenges involved in performing a successful fast gate. We
show that the RWA is a stable approximation with respect to pulse numbers: the
timescale on which we can neglect terms rotating at the atomic frequency is
negligibly affected by the number of pulses in the fast gate. In contrast, we
show that the laser pulse instability does give rise to a pulse-number
dependent effect; the fast gate infidelity is compounded with the number of
applied imperfect pulses. Using a dimensional reduction method presented here,
we find bounds on the pulse stability required to achieve two-qubit gate
fidelity thresholds.
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Physical Review A
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Journal article
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Open Access
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