Coherent quantum oscillations and echo measurements of a Si charge qubit

Demonstrates coherent charge oscillations and echo in a Si/SiGe double quantum dot, establishing the charge-qubit dynamics of the silicon platform and quantifying its sensitivity to detuning noise.

Key Results

• Measured $T_2^{\ast }$ values from $127\text{ps}$ to approximately $2.1\text{ns}$.
• Extended a $127\text{ps}$ free-induction decay to $760\text{ps}$ using charge echo.
• Connected the operating-point dependence to low-frequency detuning noise.

Links

• Journal: Physical Review B
• arXiv: 1208.0519

Zoo Links

• semiconductor-charge-qubit
• silicon-spin-qubit