Rolled-up Epsilon-near-zero Waveguide reservoir for long-range qubit entanglement

TL;DR

This paper introduces a novel rolled-up epsilon-near-zero waveguide reservoir that enhances entanglement preservation between two qubits at specific wavelengths, with potential applications in quantum communication and processing.

Contribution

It proposes a new rolled-up ENZ waveguide design that effectively preserves qubit entanglement and demonstrates its fabrication feasibility using self-rolling techniques.

Findings

The reservoir maintains entanglement at the cutoff wavelength.

Numerical results show enhanced energy transfer improves entanglement preservation.

The structure can be fabricated cost-effectively using self-rolling methods.

Abstract

Preservation of the entangled state of a quantum system is relevant in quantum applications. However, the preservation of entangled states is constrained due to the energy dissipation of the quantum system arising from the environment. As a result, the design of the environment seen by quantum bits is relevant due to its relation to the final state of the quantum system. This work presents the concurrence measure of entanglement between two qubits coupled to a rolled-up epsilon-near-zero (ENZ) waveguide reservoir consisting of an alternating layer of metal and dielectric. Our numerical calculations demonstrate that the proposed rolled-up ENZ waveguide reservoir can preserve the entanglement of two qubits at the cutoff wavelength of the reservoir via enhanced energy transfer. This proposed rolled-up ENZ waveguide can serve as a unique reservoir for various quantum technologies such as quantum communication, quantum information processing, and single-photon generation. As a proof of concept, we also demonstrate that this novel structure can be fabricated using cost-effective self-rolling techniques.