Spin-Wave Quantum Computing with Atoms in a Single-Mode Cavity

TL;DR

This paper introduces a scalable quantum computing method using holographic spin-wave excitations in atomic ensembles, enabling high-fidelity control and efficient readout without the need for single-site addressability.

Contribution

It presents a novel approach to quantum computing with collective spin waves in a one-dimensional array, eliminating the need for high single-qubit cooperativity.

Findings

Achieves high-fidelity universal linear controllability using phase shifts.

Enables efficient readout into a single cavity mode.

Does not require single-site addressability or high cooperativity.

Abstract

We present a method for network-capable quantum computing that relies on holographic spin-wave excitations stored collectively in ensembles of qubits. We construct an orthogonal basis of spin waves in a one-dimensional array and show that high-fidelity universal linear controllability can be achieved using only phase shifts, applied in both momentum and position space. Neither single-site addressability nor high single-qubit cooperativity is required, and the spin waves can be read out with high efficiency into a single cavity mode for quantum computing and networking applications.