Dismagicker: Unitary Gate for Non-Stabilizerness Reduction

TL;DR

This paper introduces dismagicker, a non-Clifford unitary gate designed to reduce non-stabilizerness in quantum states, improving classical simulation and quantum state preparation.

Contribution

It defines dismagicker as a novel tool for non-stabilizerness suppression and develops an optimization method within the Matrix Product States framework.

Findings

Non-stabilizerness reduction improves simulation accuracy.

Combining dismagicker with Clifford circuits enhances quantum state preparation.

Numerical results demonstrate effective non-stabilizerness suppression.

Abstract

We introduce the notion of dismagicker: non-Clifford unitary gate designed to reduce the non-stabilizerness (also called magic) of quantum many-body states. Although both entanglement and non-stabilizerness are fundamental quantum resources, they require distinct control strategies. While disentanglers (unitary operations that lower entanglement) are well-established in tensor network methods, analogous concept for non-stabilizerness suppression has been largely missing. In this work, we define dismagicker as non-Clifford unitary operation that actively suppresses non-stabilizerness, steering states toward classically simulatable stabilizer states. We develop optimization method for constructing dismagickers within the Matrix Product States framework. Our numerical results show that the non-stabilizerness reduction procedure, when combined with entanglement reduction steps with Clifford circuits, significantly improves the accuracy for both classical simulation of many-body systems and quantum state preparation on quantum devices. Dismagicker enriches our toolkit for the manipulation of many-body states by unifying non-stabilizerness and entanglement reduction.