Spin Relaxation Benchmarks and Individual Qubit Addressability for Holes in Quantum Dots.

ABSTRACT: We investigate hole spin relaxation in the single- and multihole regime in a 2 × 2 germanium quantum dot array. We find spin relaxation times T₁ as high as 32 and 1.2 ms for quantum dots with single- and five-hole occupations, respectively, setting benchmarks for spin relaxation times for hole quantum dots. Furthermore, we investigate qubit addressability and electric field sensitivity by measuring resonance frequency dependence of each qubit on gate voltages. We can tune the resonance frequency over a large range for both single and multihole qubits, while simultaneously finding that the resonance frequencies are only weakly dependent on neighboring gates. In particular, the five-hole qubit resonance frequency is more than 20 times as sensitive to its corresponding plung

SUBMITTER: Lawrie WIL 

PROVIDER: S-EPMC7564448 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature