Quantum state transfer between valley and photon qubits

TL;DR

This paper presents a theoretical analysis of quantum state transfer between valley and photon qubits in 2D materials, demonstrating high fidelity and yield through cavity-enhanced electron-photon interactions.

Contribution

It introduces a generic cavity-based setup and derives analytical expressions for transfer yield and fidelity, advancing understanding of valley-photon quantum state transfer.

Findings

High transfer fidelity achievable with optimized parameters

Analytical expressions for yield and fidelity derived

Numerical simulations confirm promising transfer characteristics

Abstract

The electron-photon interaction in 2D materials obeys the rule of electron valley-photon polarization correspondence. At the quantum level, such correspondence can be utilized to entangle valleys and polarizations and attain the transfer of quantum states (or information) between valley and photon qubits. Our work presents a theoretical study of the interaction between the two types of qubits and the resultant quantum state transfer. A generic setup is introduced, which involves optical cavities enhancing the electron-photon interaction as well as facilitating both the entanglement and un-entanglement between valleys and polarizations required by the transfer. The quantum system considered consists of electrons, optically excited trions, and cavity photons, with photons moving in and out of the system. A wave equation based analysis is performed, and analytical expressions are derived for the two important figures of merits that characterize the transfer, namely, yield and fidelity, allowing for the investigation of their dependences on various qubit and cavity parameters. A numerical study of the yield and fidelity has also been carried out. Overall, this work shows promising characteristics in the valley-photon state transfer, with the conclusion that the valley-polarization correspondence can be exploited to achieve the transfer with good yield and high fidelity.