Operator Quantum Zeno Effect: Protecting Quantum Information with Noisy Two-Qubit Interactions

TL;DR

This paper introduces an operator quantum Zeno effect that slows the evolution of physical observables via measurements, enabling protection of quantum information from decoherence using noisy two-qubit interactions.

Contribution

It presents a novel operator quantum Zeno effect that protects quantum information with noisy two-qubit measurements, expanding the applicability of quantum Zeno techniques.

Findings

Operator quantum Zeno effect can slow observable evolution.

Quantum information can be protected from decoherence.

Protection is achievable with noisy two-qubit interactions.

Abstract

The time evolution of some quantum states can be slowed down or even stopped under frequent measurements. This is the usual quantum Zeno effect. Here, we report an operator quantum Zeno effect, in which the evolution of some physical observables is slowed down through measurements even though the quantum state changes randomly with time. Based on the operator quantum Zeno effect, we show how we can protect quantum information from decoherence with two-qubit measurements, realizable with noisy two-qubit interactions.