Abstract
Superconducting circuits extensively rely on the Josephson junction as a nonlinear electronic element for manipulating quantum information and mediating photon interactions. Despite continuing efforts in pushing the coherence of Josephson circuits, the best photon lifetimes have been demonstrated in microwave cavities. Nevertheless, architectures based on quantum memories require a qubit element for logical operations at the cost of introducing additional loss channels and limiting process fidelities. Here, we directly operate the oscillator as an isolated two-level system by tailoring its Hilbert space. Implementing a flux-tunable inductive coupling between two resonators, we can selectively Rabi drive the lowest eigenstates by dynamically activating a three-wave interaction through parametric flux modulation. Measuring the Wigner function confirms that we can prepare arbitrary states confined in the single-photon manifold, with measured coherence times limited by the oscillator intrinsic quality factor. This architectural shift in engineering oscillators with stimulated nonlinearity can be exploited for designing long-lived quantum modules and offers flexibility in studying non-equilibrium physics with photons in a field-programmable simulator.
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Data availability
The data represented in Fig. 3b are available as source data. All other data that support the plots within this paper and other findings of this study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank M. Mirrahimi and J. A. Aumentado for valuable discussions, G. Zhang and P. Mundada for technical contributions and MIT Lincoln Labs for providing a travelling-wave parametric amplifier for this experiment. This work was supported by the Army Research Office through grant no. W911NF-15-1-0421.
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A.V. designed the device, performed the experiments and analysed the data. Z.H., P.G. and J.K. provided theoretical support. A.A.H. supervised the whole experiment. All authors contributed to the preparation of this manuscript.
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Peer review information Nature Physics thanks Gerhard Kirchmair, Anton Kockum and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Source Data Fig. 3
Source data for Fig. 3b (experimental)
Source Data Fig. 3
Source data for Fig. 3b (theory)
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Vrajitoarea, A., Huang, Z., Groszkowski, P. et al. Quantum control of an oscillator using a stimulated Josephson nonlinearity. Nat. Phys. 16, 211–217 (2020). https://doi.org/10.1038/s41567-019-0703-5
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DOI: https://doi.org/10.1038/s41567-019-0703-5
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