Design Constraints for Unruh-DeWitt Quantum Computers

TL;DR

This paper explores the design and feasibility of Unruh-DeWitt quantum computers using spin qubits coupled to Luttinger liquids, proposing experimental setups and theoretical models for quantum information processing in condensed matter systems.

Contribution

It introduces a new framework for realizing Unruh-DeWitt quantum computers with solid state systems and provides design constraints and experimental scenarios for their implementation.

Findings

Unruh-DeWitt detectors can perform quantum computations via bosonization.

Quantum channels between qubits can be nearly perfect in Luttinger liquids.

Proposes experimental setups using graphene and quantum Hall phases.

Abstract

The Unruh-DeWitt particle detector model has found success in demonstrating quantum information channels with non-zero channel capacity between qubits and quantum fields. These detector models provide the necessary framework for experimentally realizable Unruh-DeWitt Quantum Computers with near-perfect channel capacity. We propose spin qubits with gate-controlled coupling to Luttinger liquids as a laboratory setting for Unruh-DeWitt detectors and general design constraints that underpin their feasibility in this and other settings. We also present several experimental scenarios including graphene ribbons, edges states in the quantum spin Hall phase of HgTe quantum wells, and the recently discovered quantum anomalous Hall phase in transition metal dichalcogenides. Theoretically, through bosonization, we show that Unruh-DeWitt detectors can carry out Quantum Computations and when they can make perfect quantum communication channels between qubits via the Luttinger liquid. Our results point the way toward an all-to-all connected solid state quantum computer and the experimental study of quantum information in quantum fields via condensed matter physics.