Quantum computing with an electron spin ensemble

TL;DR

This paper proposes a method for quantum computing using collective electron spin excitations in a solid medium, coupled via a superconducting cavity, enabling quantum register encoding and gate operations.

Contribution

It introduces a novel approach to quantum computing with electron spins, utilizing collective excitations and cavity coupling for quantum register manipulation.

Findings

Demonstrates encoding of qubits in collective electron spin waves.

Proposes a scheme for implementing quantum gates using cavity and magnetic field gradients.

Suggests feasibility of solid-state quantum computing with this architecture.

Abstract

We propose to encode a register of quantum bits in different collective electron spin wave excitations in a solid medium. Coupling to spins is enabled by locating them in the vicinity of a superconducting transmission line cavity, and making use of their strong collective coupling to the quantized radiation field. The transformation between different spin waves is achieved by applying gradient magnetic fields across the sample, while a Cooper Pair Box, resonant with the cavity field, may be used to carry out one- and two-qubit gate operations.