Hole Spin Relaxation in Ge/Si Core-Shell Nanowire Qubits

Research output: Contribution to journalJournal articleResearchpeer-review


  • pdf

    2.07 MB, PDF document

Controlling decoherence is the most challenging task in realizing quantum information hardware. Single electron spins in gallium arsenide are a leading candidate among solid- state implementations, however strong coupling to nuclear spins in the substrate hinders this approach. To realize spin qubits in a nuclear-spin-free system, intensive studies based on group-IV semiconductor are being pursued. In this case, the challenge is primarily control of materials and interfaces, and device nanofabrication. We report important steps toward implementing spin qubits in a predominantly nuclear-spin-free system by demonstrating state preparation, pulsed gate control, and charge-sensing spin readout of confined hole spins in a one-dimensional Ge/Si nanowire. With fast gating, we measure T1 spin relaxation times in coupled quantum dots approaching 1 ms, increasing with lower magnetic field, consistent with a spin-orbit mechanism that is usually masked by hyperfine contributions.
Original languageEnglish
JournalNature Nanotechnology
Pages (from-to)47-50
Publication statusPublished - 21 Oct 2011
Externally publishedYes

    Research areas

  • cond-mat.mes-hall, quant-ph

Number of downloads are based on statistics from Google Scholar and www.ku.dk

No data available

ID: 38327205