Coherent control and suppressed nuclear feedback of a single quantum dot hole qubit

Understand

Future communication and computation technologies that exploit quantum information require robust and well-isolated qubits.

• Electron spins in III-V semiconductor quantum dots, while promising candidates, see their dynamics limited by undesirable hysteresis and decohering effects of the nuclear spin bath.
• Replacing electrons with holes should suppress the hyperfine interaction and consequently eliminate strong nuclear effects.
• Using picosecond optical pulses, we demonstrate coherent control of a single hole qubit and examine both free-induction and spin-echo decay.