.png){kind=icon}
.png){kind=icon}
Return
Full-Permutation Dynamical Decoupling in Triple-Quantum-Dot Spin Qubits
.png){kind=icon}
OA
AI
DOI：10.1103/PRXQuantum.5.020356.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Dynamical decoupling of spin qubits in silicon can increase fidelity and can be used to extract the frequency spectra of noise processes. We demonstrate a full-permutation dynamical decoupling technique that cyclically exchanges the spins in a triple-quantum-dot qubit. This sequence not only suppresses both low-frequency charge-noise-induced and magnetic-noise-induced errors; it also refocuses leakage errors to first order, which is particularly interesting for encoded exchange-only qubits. For a specific construction, which we call NZ1y, the qubit is isolated from error sources to such a degree that we measure a remarkable exchange pulse error of 2.8 x 10-5. This sequence maintains a quantum state for roughly 18,000 exchange pulses, extending the qubit coherence from T2 & lowast; = 2 mu s to T2 = 720 mu s. We experimentally validate an error model that includes 1/f charge noise and 1/f magnetic noise in two ways: by direct exchange-qubit simulation and by integration of the assumed noise spectra with derived filter functions, both of which reproduce the measured error and leakage with respect to a change of the repetition rate.
Keywords:
NOISE
DECOHERENCE
COMPUTATION
COHERENCE
FIDELITY