Quantum-Dot-Based Resonant Exchange Qubit

TY - JOUR

T1 - Quantum-Dot-Based Resonant Exchange Qubit

AU - Medford, J.

AU - Beil, Johannes

AU - Taylor, J.M.

AU - Rashba, E.I.

AU - Lu, H.

AU - Gossard, A.

AU - Marcus, Charles M.

PY - 2013/7/31

Y1 - 2013/7/31

N2 - We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and the oscillatory transverse field, allowing rapid and full qubit control via rf gate-voltage pulses. We demonstrate two-axis control at a detuning sweet spot, where leakage due to hyperfine coupling is suppressed by the large exchange gap. A π/2-gate time of 2.5 ns and a coherence time of 19 μs, using multipulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.

AB - We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and the oscillatory transverse field, allowing rapid and full qubit control via rf gate-voltage pulses. We demonstrate two-axis control at a detuning sweet spot, where leakage due to hyperfine coupling is suppressed by the large exchange gap. A π/2-gate time of 2.5 ns and a coherence time of 19 μs, using multipulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.

U2 - 10.1103/PhysRevLett.111.050501

DO - 10.1103/PhysRevLett.111.050501

M3 - Journal article

SN - 0031-9007

VL - 111

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 050501

ER -