Quantum computation with quantum-dot spin qubits inside a cavity

TL;DR

This paper proposes a scalable quantum computing scheme using quantum-dot spin qubits in a cavity, enabling universal gates that are insensitive to cavity states and allowing parallel operations.

Contribution

It introduces a method for implementing universal quantum gates with quantum-dot spin qubits inside a cavity, independent of cavity mode states and suitable for scalable quantum computation.

Findings

Gate operations are insensitive to thermal cavity fields.

Individual addressing and switching of cavity interactions are feasible.

Parallel gate operations can be performed efficiently.

Abstract

Universal set of quantum gates are realized from the conduction-band electron spin qubits of quantum dots embedded in a microcavity via two-channel Raman interaction. All of the gate operations are independent of the cavity mode states, \emph{i.e.}, insensitive to the thermal cavity field. Individual addressing and effective switch of the cavity mediated interaction are directly possible here. Meanwhile, gate operations also can be carried out in parallel. The simple realization of needed interaction for selective qubits makes current scenario more suitable for scalable quantum computation.