Kavli Affiliate: Mohammad Mirhosseini
| First 5 Authors: Alkım B. Bozkurt, Omid Golami, Yue Yu, Hao Tian, Mohammad Mirhosseini
| Summary:
Long-lived mechanical oscillators are actively pursued as critical resources
for quantum storage, sensing, and transduction. However, achieving
deterministic quantum control while limiting mechanical dissipation remains a
persistent challenge. Here, we demonstrate strong coupling between a transmon
superconducting qubit and an ultra-long-lived nanomechanical oscillator
($T_text{1} approx 25 text{ ms}$ at 5 GHz, $Q approx 0.8 times 10^9$) by
leveraging the low acoustic loss in silicon and phononic bandgap engineering.
The qubit-oscillator system achieves large cooperativity ($C_{T_1}approx
1.5times10^5$, $C_{T_2}approx 150$), enabling the generation of non-classical
states and the investigation of mechanisms underlying mechanical decoherence.
We show that dynamical decoupling$unicode{x2014}$implemented through the
qubit$unicode{x2014}$can mitigate decoherence, leading to a mechanical
coherence time of $T_2approx 1 text{ ms}$. These findings extend the
exceptional storage capabilities of mechanical oscillators to the quantum
regime, putting them forward as compact bosonic elements for future
applications in quantum computing and metrology.
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