Coherence of a dynamically decoupled quantum-dot hole spin

Abstract

A heavy hole confined to an InGaAs quantum dot promises the union of a stable spin and optical coherence to form a near perfect, high-bandwidth spin-photon interface. Despite theoretical predictions and encouraging preliminary measurements, the dynamic processes determining the coherence of the hole spin are yet to be understood. Here, we establish the regimes that allow for a highly coherent hole spin in these systems, recovering a crossover from hyperfine to electrical-noise dominated decoherence with a few-Tesla external magnetic field. Dynamical decoupling allows us to reach the longest ground-state coherence time, T2, of 4.4 $\mu$s, observed in this system. The improvement of coherence we measure is quantitatively supported by an independent analysis of the local electrical environment.

Supplemental material available upon request

References in corpus (7)

• The Quantum Internet
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Phase-tuned entangled state generation between distant spin qubits
• Hole - Nuclear Spin Interaction in Quantum Dots
• Electrically-tunable hole g-factor of an optically-active quantum dot for fast spin rotations
• Dynamics of a mesoscopic nuclear spin ensemble interacting with an optically driven electron spin

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