Tunable Hybrid Qubit in a GaAs Double Quantum Dot

Abstract

We experimentally demonstrate a tunable hybrid qubit in a five-electron GaAs double quantum dot. The qubit is encoded in the (1,4) charge regime of the double dot and can be manipulated completely electrically. More importantly, dot anharmonicity leads to quasiparallel energy levels and a new anticrossing, which help preserve quantum coherence of the qubit and yield a useful working point. We have performed Larmor precession and Ramsey fringe experiments near the new working point and find that the qubit decoherence time is significantly improved over a charge qubit. This work shows a new way to encode a semiconductor qubit that is controllable and coherent.

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Cited by in corpus (54)

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• Fast spin exchange between two distant quantum dots
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• A quadrupolar exchange-only spin qubit
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• Adiabatic two-qubit gates in capacitively coupled quantum dot hybrid qubits
• Controlled Quantum Operations of a Semiconductor Three-Qubit System
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• Extending Qubit Coherence Time via Hybrid Dynamical Decoupling
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