Strong Local Passivity in Unconventional Scenarios: A New Protocol for Amplified Quantum Energy Teleportation

TL;DR

This paper broadens the scope of quantum energy teleportation by demonstrating strong local passivity beyond traditional constraints, introducing a local effective Hamiltonian, and achieving significantly amplified energy extraction verified on quantum hardware.

Contribution

It generalizes QET protocols beyond conventional constraints, introduces a local effective Hamiltonian, and demonstrates a 7.2-fold increase in energy extraction capability.

Findings

SLP can occur beyond traditional constraints.

The new protocol amplifies energy extraction by 7.2 times.

Experimental implementation confirms theoretical predictions.

Abstract

Quantum energy teleportation (QET) has been proposed to overcome the restrictions of strong local passivity (SLP) and to facilitate energy transfer in quantum systems. Traditionally, QET has only been considered under strict constraints, including the requirements that the initial state be the ground state of an interacting Hamiltonian, that Alice's measurement commute with the interaction terms, and that entanglement be present. These constraints have significantly limited the broader applicability of QET protocols. In this work, we demonstrate that SLP can arise beyond these conventional constraints, establishing the necessity of QET in a wider range of scenarios for local energy extraction. This leads to a more flexible and generalized framework for QET. Furthermore, we introduce the concept of a ``local effective Hamiltonian,'' which eliminates the need for optimization techniques in determining Bob's optimal energy extraction in QET protocols. As an additional advantage, the amount of energy that can be extracted using our new protocol is amplified to be 7.2 times higher than that of the original protocol. These advancements enhance our understanding of QET and extend its broader applications to quantum technologies. To support our findings, we implement the protocol on quantum hardware, confirming its theoretical validity and experimental feasibility.