Work

Twisted light generates robust many-body states for practical quantum computing

Year: 2026

Type: article

Abstract: Twisted light carries orbital angular momentum (OAM) and can drive excitations of confined, interacting electrons that are dark to uniform dipolar probes. Here, we show how this “beyond-Kohn's-theorem” optical channel can become a concrete control primitive for quantum computing. Correlation sectors in few-electron quantum dots—characterized by the relative angular momentum quantum number—form a tunable ladder of many-body states that are robust in the limited sense of symmetry-protected selection rules and persistent chiral spectroscopic fingerprints; full topological gap protection requires three or more electrons. A twisted-light pulse with prescribed OAM index and polarization provides fast optical write, read, and scalable addressing of these sectors via the selection rule Δ | m | = ± ( l + σ ) . In the analytically solvable Calogero ( 1 / r 2 ) interaction limit, both the energy spectrum and the twisted-light matrix elements are closed-form functions of the interaction strength, allowing gate parameters (Rabi frequency, qubit frequency, anharmonicity, and leakage rates) to be written down explicitly. We map these results onto a universal single-qubit gate set, propose a concrete two-qubit entangling mechanism via state-dependent Coulomb coupling between adjacent dots, and identify the dominant decoherence channel (quadrupolar charge noise). A semianalytic N = 3 extension using the 1 / N expansion provides a design-level scaffold for the topological roadmap, including quasihole sector addressing. The central operational message is that twisted light enables WRITE (pulse-create a correlation sector), READ (spectroscopically diagnose correlations), and SCALE (optical addressing via spatial light modulator) in a unified photonic control layer. Throughout, screened and Coulomb interactions preserve the same qualitative chiral fingerprints established in the solvable limit.

Source: APS Open Science

DOI: 10.1103/f4qc-3ckt

Authors: F. J. Rodríguez, L. Quiroga, N. F. Johnson

Institutions: Universidad de Los Andes, Universidad de Los Andes, George Washington University

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Universidad de los Andes, Facultad de Ciencias, Universidad de los Andes

Award: G4419456645