Noise-resilient Universal Quantum Computing in the Presence of Anisotropic Noise

TL;DR

This paper introduces a universal quantum gate set resilient to anisotropic decoherence by leveraging initial system-bath entanglement, eliminating the need for active error correction during computation.

Contribution

It presents a novel method to counteract anisotropic noise in quantum computing using initial entanglement, avoiding traditional error correction overhead.

Findings

Effective decoupling of anisotropic system-bath interactions.

Quantum computation proceeds unaffected by dominant decoherence.

Elimination of active error correction overhead.

Abstract

We propose a universal gate set for quantum computing that operates in the presence of decoherence without the overhead of active error correction. We show that a broad class of anisotropic system--bath couplings can be effectively decoupled by preparing an appropriate system--bath entangled initial state. The initially established entanglement serves as a resource to cancel out the dominant decoherence during evolution, enabling quantum computation to proceed as if the system were effective decoupled from its environment.