Quantum computers based on electron spins controlled by ultra-fast, off-resonant, single optical pulses

Abstract

We describe a fast quantum computer based on optically controlled electron spins in charged quantum dots that are coupled to microcavities. This scheme uses broad-band optical pulses to rotate electron spins and provide the clock signal to the system. Non-local two-qubit gates are performed by phase shifts induced by electron spins on laser pulses propagating along a shared waveguide. Numerical simulations of this scheme demonstrate high-fidelity single-qubit and two-qubit gates with operation times comparable to the inverse Zeeman frequency.

4 pages, 4 figures, introduction is clarified, the section on two-qubit gates was expanded and much more detail about gate fidelities is given, figures were modified, one figure replaced with a figure showing gate fidelities for relevant parameters

References in corpus (2)

• Hybrid quantum repeater based on dispersive CQED interactions between matter qubits and bright coherent light
• Local Fault-tolerant Quantum Computation

Cited by in corpus (6)

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• Adiabatic optical entanglement between electron spins in separate quantum dots
• The two-impurity Kondo model with spin-orbit interactions