Coherent Josephson qubit suitable for scalable quantum integrated circuits.

By R. Barends, J. Kelly, A. Megrant, D. Sank, Evan Jeffrey, Yu Chen, Yi Yin, B. Chiaro, J. Mutus, C. Neill and 6 more. Physical Review Letters, 2013

655 citations recorded by the source corpus.

We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 μs. This is achieved by using a geometry designed to both minimize radiative loss and reduce coupling to materials-related defects. At these levels of coherence, we find a fine structure in the qubit energy lifetime as a function of frequency, indicating the presence of a sparse population of incoherent, weakly coupled two-level defects. We elucidate this defect physics by experimentally varying the geometry and by a model analysis. Our "Xmon" qubit combines facile fabrication, straightforward connectivity, fast control, and long coherence, opening a viable route to constructing a chip-based quantum computer.

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

View Paper: https://www.semanticscholar.org/paper/aa8437f0ca3712c6fa497855e08c9d112480ae3e

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Citations in the corpus

Perfect quantum state transfer in a superconducting qubit chain with parametrically tunable couplings. (2018, methodology): “The experimental device consists of five cross-shaped transmon qubits (Xmons, Q0− Q4) [24, 46, 47] arranged in a linear array with nearly identical nearest-neighbor coupling strengths.”
Quantum information processing with superconducting circuits: a review (2016, background): “‘Historically’, the CPB evolved from the original charge qubit (1999) [11] via the quantronium (2002) [15, 204, 207] and CPBcQED (2004) [21, 23], to the transmon (2007) [25] and the Xmon (2013) [149, 150].”
Digitized adiabatic quantum computing with a superconducting circuit (2015, background): “As quantum hardware improves, the implementation of near-optimal schemes such as this becomes increasingly viable.”
Microwave photonics with superconducting quantum circuits (2017, methodology): “The planar transmon circuits have been adapted to form xmon-qubit circuits [62]”
1 / f noise: Implications for solid-state quantum information (2013, background): “Barends et al. (2013) have demonstrated a planar, tunable superconducting qubit with energy relaxation times up to 44 µs.”