Studying phonon coherence with a quantum sensor
- URL: http://arxiv.org/abs/2302.00221v1
- Date: Wed, 1 Feb 2023 03:52:01 GMT
- Title: Studying phonon coherence with a quantum sensor
- Authors: Agnetta Y. Cleland, E. Alex Wollack, Amir H. Safavi-Naeini
- Abstract summary: We use a superconducting qubit as a quantum sensor to perform phonon number-resolved measurements on a phononic crystal cavity.
We observe nonexponential energy decay and a state size-dependent reduction of the dephasing rate.
Our findings comprise a detailed examination of TLS-induced phonon decoherence in the quantum regime.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In the field of quantum technology, nanomechanical oscillators offer a host
of useful properties given their compact size, long lifetimes, and ability to
detect force and motion. Their integration with superconducting quantum
circuits shows promise for hardware-efficient computation architectures and
error-correction protocols based on superpositions of mechanical coherent
states. One limitation of this approach is decoherence processes affecting the
mechanical oscillator. Of particular interest are two-level system (TLS)
defects in the resonator host material, which have been widely studied in the
classical domain, primarily via measurements of the material loss tangent. In
this manuscript, we use a superconducting qubit as a quantum sensor to perform
phonon number-resolved measurements on a phononic crystal cavity. This enables
a high-resolution study of mechanical dissipation and dephasing in coherent
states of variable size (mean phonon number $\navg\simeq1-10$). We observe
nonexponential energy decay and a state size-dependent reduction of the
dephasing rate, which we attribute to interactions with TLS. Using a numerical
model, we reproduce the energy decay signatures (and to a lesser extent, the
dephasing signatures) via mechanical emission into a small ensemble ($N=5$) of
saturable and rapidly dephasing TLS. Our findings comprise a detailed
examination of TLS-induced phonon decoherence in the quantum regime.
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