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2017 ; 7
(1
): 11536
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Qubit-mediated deterministic nonlinear gates for quantum oscillators
#MMPMID28912504
Park K
; Marek P
; Filip R
Sci Rep
2017[Sep]; 7
(1
): 11536
PMID28912504
show ga
Quantum nonlinear operations for harmonic oscillator systems play a key role in
the development of analog quantum simulators and computers. Since strong highly
nonlinear operations are often unavailable in the existing physical systems, it
is a common practice to approximate them by using conditional measurement-induced
methods. The conditional approach has several drawbacks, the most severe of which
is the exponentially decreasing success rate of the strong and complex nonlinear
operations. We show that by using a suitable two level system sequentially
interacting with the oscillator, it is possible to resolve these issues and
implement a nonlinear operation both nearly deterministically and nearly
perfectly. We explicitly demonstrate the approach by constructing self-Kerr and
cross-Kerr couplings in a realistic situation, which require a feasible
dispersive coupling between the two-level system and the oscillator.