The Resonant Exchange Qubit

Abstract

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 multi-pulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.

References in corpus (10)

• Charge insensitive qubit design derived from the Cooper pair box
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• How to Enhance Dephasing Time in Superconducting Qubits
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Coherent spin manipulation in an exchange-only qubit
• Electrically-protected resonant exchange qubits in triple quantum dots
• Two-Qubit Gates for Resonant Exchange Qubits

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