Quantum Coherence in a One-Electron Semiconductor Charge Qubit

Demonstrates coherent oscillations in a semiconductor charge qubit: a single electron in a double quantum dot with qubit states defined by left/right dot occupation. Shows Rabi oscillations and Ramsey fringes, establishing the semiconductor charge qubit as a coherent platform despite severe charge noise.

Key Results

• Charge qubit: |L⟩ and |R⟩ states in double quantum dot
• Maximum fitted coherence time $T_2=7\pm 2.5$ ns at the zero-detuning sweet spot
• Interdot tunnel splittings $2\Delta /h=3.3$ and $4.5$ GHz in the time-domain data
• Platform: GaAs/AlGaAs double quantum dot

Links

• Journal: Physical Review Letters
• arXiv: 1008.3089

Zoo Links

• semiconductor-charge-qubit
• spin-qubit