Transforming graph states using single-qubit operations

High fidelity single qubit operations using pulsed electron paramagnetic resonance.

Systematic errors in spin rotation operations using simple rf pulses place severe limitations on the usefulness of the pulsed magnetic resonance methods in quantum computing applications. In particular, the fidelity of quantum logic operations performed on electron spin qubits falls well below the threshold for the application of quantum algorithms. Using three independent techniques, we demons...

Optimal discrimination of single-qubit mixed states

Applications of Graph Operations

In this paper, some applications of our earlier results in working with chemical graphs are presented.

Single-Qubit Operations with the Nitrogen-Vacancy Center in Diamond

A concept combining optics and microwave pulses with the negative charge-state of the nitrogenvacancy (NV– ) center in diamond is demonstrated through experiments that are equivalent to single-qubit gates, and decoherence for this qubit is examined. The spin levels of the ground state provide the two-level system. Optical excitation provides polarization of these states. The polarized state is ...

Predicted ultrafast single-qubit operations in semiconductor quantum dots

Several proposals for scalable quantum computation rely on the manipulation of the spin of individual electrons in semiconductors. We show that a spin-sensitive optical Stark effect will produce a coherent rotation of spin in quantum dots containing a single electron. The calculated magnitude of the effective magnetic field depends on the dot band gap and the strain. We predict that in InAs/ In...