Abstract
Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. Here we demonstrate two-axis control of a spin 3/2 qubit in natural Ge. The qubit is formed in a hut wire double quantum dot device. The Pauli spin blockade principle allowed us to demonstrate electric dipole spin resonance by applying a radio frequency electric field to one of the electrodes defining the double quantum dot. Coherent hole spin oscillations with Rabi frequencies reaching 140 MHz are demonstrated and dephasing times of 130 ns are measured. The reported results emphasize the potential of Ge as a platform for fast and electrically tunable hole spin qubit devices.
Highlights
Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits
In this work we demonstrate the ability to capture holes in double quantum dots (DQDs) fabricated from Ge hut wires (HWs)
We make use of the Pauli spin blockade (PSB)[20] mechanism and the electric dipole spin resonance (EDSR) technique in order to demonstrate the addressability of single holes
Summary
Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. The Pauli spin blockade principle allowed us to demonstrate electric dipole spin resonance by applying a radio frequency electric field to one of the electrodes defining the double quantum dot. Coherent hole spin oscillations with Rabi frequencies reaching 140 MHz are demonstrated and dephasing times of 130 ns are measured. In this work we demonstrate the ability to capture holes in double quantum dots (DQDs) fabricated from Ge HWs. We make use of the Pauli spin blockade (PSB)[20] mechanism and the electric dipole spin resonance (EDSR) technique in order to demonstrate the addressability of single holes.
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