Charge and spin manipulation in a few-electron double dot
arXiv:cond-mat/0510151 · doi:10.1016/j.physe.2006.02.033
Abstract
We demonstrate high speed manipulation of a few-electron double quantum dot. In the one-electron regime, the double dot forms a charge qubit. Microwaves are used drive transitions between the (1,0) and (0,1) charge states of the double dot. A local quantum point contact charge detector measures the photon-induced change in occupancy of the charge states. Charge detection is used to measure T1~16 ns and also provides a lower bound estimate for T2* of 400 ps for the charge qubit. In the two-electron regime we use pulsed-gate techniques to measure the singlet-triplet relaxation time for nearly-degenerate spin states. These experiments demonstrate that the hyperfine interaction leads to fast spin relaxation at low magnetic fields. Finally, we discuss how two-electron spin states can be used to form a logical spin qubit.
Presented at EP2DS-16, to be published in Physica E
References in corpus (4)
- Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot
- Manipulation of a single charge in a double quantum dot
- Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot
- Pulsed-gate measurements of the singlet-triplet relaxation time in a two-electron double quantum dot
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- Optimal post-processing for a generic single-shot qubit readout
- Measurement-free implementations of small-scale surface codes for quantum dot qubits
- Characteristic molecular properties of one-electron double quantum rings under magnetic fields
- Spin flip locking by the tunneling and relaxation in a driven double quantum dot with spin-orbit coupling
- Entanglement and transport anomalies in nanowires