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Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
We demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout.
Spins in few-electron quantum dots
The canonical example of a quantum-mechanical two-level system is spin. The simplest picture of spin is a magnetic moment pointing up or down. The full quantum properties of spin become apparent in
Coulomb blockade and the Kondo effect in single-atom transistors
Two related molecules containing a Co ion bonded to polypyridyl ligands, attached to insulating tethers of different lengths are examined, enabling the fabrication of devices that exhibit either single-electron phenomena, such as Coulomb blockade or the Kondo effect.
Relaxation, dephasing, and quantum control of electron spins in double quantum dots
Recent experiments have demonstrated quantum manipulation of two-electron spin states in double quantum dots using electrically controlled exchange interactions. Here we present a detailed theory for
Quantum coherence in a one-electron semiconductor charge qubit.
Quantum coherence in a semiconductor charge qubit formed from a GaAs double quantum dot containing a single electron is studied using a quantum point contact charge detector.
Manipulation of a single charge in a double quantum dot.
It is shown that under resonant conditions, microwaves drive transitions between the (1,0) and (0,1) charge states of the double dot using microwave excitation results in a fully tunable double quantum dot.
Correlating the nanostructure and electronic properties of InAs nanowires.
At low temperatures, FETs fabricated on high defect density segments of InAs nanowires showed transport properties consistent with single electron charging, even on devices with low resistance ohmic contacts, reinforcing the importance of controlling the defect density.
Triplet–singlet spin relaxation via nuclei in a double quantum dot
It is shown that electron spin flips are dominated by nuclear interactions and are slowed by several orders of magnitude when a magnetic field of a few millitesla is applied, having significant implications for spin-based information processing.
Singlet-triplet spin blockade and charge sensing in a few-electron double quantum dot
Singlet-triplet spin blockade in a few-electron lateral double quantum dot is investigated using simultaneous transport and charge-sensing measurements. Transport from the (1,1) to the (0,2) electron
Suppressing Spin Qubit Dephasing by Nuclear State Preparation
A method of preparing the nuclear spin environment that suppresses the relevant component of nuclear spin fluctuations below its equilibrium value by a factor of ∼70 is reported, extending the inhomogeneous dephasing time for the two-electron spin state beyond 1 microsecond.