Quantum Computational Gates with Radiation Free Couplings

TL;DR

This paper proposes a radiation-free, three-state quantum gate mechanism that utilizes static bias couplings, potentially enabling dissipation-free qubit operations with a physical implementation based on Aharonov-Bohm loops and Hall effect readout.

Contribution

It introduces a novel three-state system for quantum gates using static bias couplings, avoiding radiation and dissipation, with a proposed physical realization.

Findings

All fundamental single and double qubit gates can be realized.

The mechanism operates with an unoccupied third level during gate operations.

A possible implementation involves Aharonov-Bohm loops and Hall effect detection.

Abstract

We examine a generic three state mechanism which realizes all fundamental single and double qubit quantum logic gates operating under the effect of adiabatically controllable static (radiation free) bias couplings between the states. At the instant of time that the gate operations are defined the third level is unoccupied which, in a certain sense, derives analogy with the recently suggested dissipation free qubit subspaces. The physical implementation of the mechanism is tentatively suggested in a form of the Aharonov-Bohm persistent current loop in crossed electric and magnetic fields, with the output of the loop read out by a (quantum) Hall effect aided mechanism.