Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture.

By H. Paik, David Schuster, Lev S. Bishop, G. Kirchmair, G. Catelani, A. Sears, Blake R. Johnson, M. Reagor, Luigi Frunzio, L. Glazman and 3 more. Physical Review Letters, 2011

947 citations recorded by the source corpus.

Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating quantum behavior and scalability. However, the future prospects ultimately depend upon the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for superconducting quantum circuits employing a three-dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal. With the new architecture, we demonstrate that Josephson junction qubits are highly coherent, with T2 ∼ 10 to 20 μs without the use of spin echo, and highly stable, showing no evidence for 1/f critical current noise. These results suggest that the overall quality of Josephson junctions in these qubits will allow error rates of a few 10(-4), approaching the error correction threshold.

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

View Paper: https://www.semanticscholar.org/paper/1c174d760b4820df83ad529ef6b1d1390dc853f4

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Citations in the corpus

Low-Disorder Microwave Cavity Lattices for Quantum Simulation with Photons (2012, methodology): “Removing sources of decoherence constitutes a great deal of effort in superconducting qubit research, and a notable method of increasing T1 is using a 3-D superconducting cavity; in which coherence times of over 60μs have been observed [78].”
Atom-light interactions in quasi-one-dimensional nanostructures: A Green's-function perspective (2016, background): “In the past decade, atoms and other quantum emitters have been interfaced with the electromagnetic fields of a plethora of quasi-1D nanostructured reservoirs, ranging from high-quality optical [5–10] and microwave [11, 12] cavities to dielectric [13–20], metallic [21–24], and superconducting [25, 26”
Three-Dimensional Superconducting Resonators at T<20 mK with Photon Lifetimes up to τ=2 s (2018, background): “These are much higher than the highest Q ∼ 108 reported in various quantum regime studies [3,4] with τ ∼ 1 ms.”
New class of quantum error-correcting codes for a bosonic mode (2016, background): “Superconducting qubit phase coherence times have risen some five orders of magnitude and can now reach ∼ 100 μs in 3D cavity geometries [27, 28] and up to ∼ 40 μs in planar geometries [29–31].”
Quantum simulation with interacting photons (2016, background): “Further improvement of the coherence times for transmon qubits coupled to superconducting resonators has recently been achieved by building three-dimensional resonators [142, 196].”