Superconducting qubit in a waveguide cavity with a coherence time approaching 0.1 ms

By C. Rigetti, Jay M. Gambetta, S. Poletto, B. Plourde, Jerry M. Chow, A. C'orcoles, John A. Smolin, Seth T. Merkel, J. Rozen, G. Keefe and 3 more. 2012

518 citations recorded by the source corpus.

We report a superconducting artificial atom with a coherence time of ${T}_{2}^{*}=92$ $\ensuremath{\mu}$s and energy relaxation time ${T}_{1}=70$ $\ensuremath{\mu}$s. The system consists of a single Josephson junction transmon qubit on a sapphire substrate embedded in an otherwise empty copper waveguide cavity whose lowest eigenmode is dispersively coupled to the qubit transition. We attribute the factor of four increase in the coherence quality factor relative to previous reports to device modifications aimed at reducing qubit dephasing from residual cavity photons. This simple device holds promise as a robust and easily produced artificial quantum system whose intrinsic coherence properties are sufficient to allow tests of quantum error correction.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/d40e21a448d601da8cff898221a39ea085556c1e

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Microwave photonics with superconducting quantum circuits (2017, background): “Later, this coherence time was improved even further [154].”
Universal Gate for Fixed-Frequency Qubits via a Tunable Bus (2016, methodology): “The second approach is to use fixed-frequency qubits, which have demonstrated superior coherence properties in circuits implemented using two [12] and threedimensional [13, 14] architectures.”
Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “, 2011) or embedding the transmon qubit in a 3D circuit QED with a high Q factor (Paik et al., 2011; Rigetti et al., 2012), coherence times of SC qubits have been enhanced to around one hundred microseconds.”
Coherent Conversion Between Microwave and Optical Photons—An Overview of Physical Implementations (2019, unknown): “[26] C.”