Certifying Multilevel Coherence in the Motional State of a Trapped Ion
- URL: http://arxiv.org/abs/2106.12939v2
- Date: Wed, 10 Nov 2021 20:35:06 GMT
- Title: Certifying Multilevel Coherence in the Motional State of a Trapped Ion
- Authors: Ollie Corfield, Jake Lishman, Chungsun Lee, Jacopo Mosca Toba, George
Porter, Johannes M. Heinrich, Simon C. Webster, Florian Mintert, Richard C.
Thompson
- Abstract summary: coherent superposition of three motional Fock states of a single trapped ion is experimentally certified.
This demonstrates that high-level coherence can be verified and investigated with simple, nonideal control methods.
- Score: 0.38813406044213633
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum coherence is one of the clearest departures from classical physics,
exhibited when a system is in a superposition of different basis states. Here
the coherent superposition of three motional Fock states of a single trapped
ion is experimentally certified, with a procedure provably robust against
imperfect operation. As the motional state cannot be directly interrogated, our
scheme uses an interference pattern generated by projective measurement of the
coupled qubit state. The minimum number of coherently superposed states is
inferred from a series of threshold values based on analysis of the
interference pattern. This demonstrates that high-level coherence can be
verified and investigated with simple, nonideal control methods well-suited to
noisy intermediate-scale quantum devices.
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