Entanglement between an NV Center and Chiral Photons in a Topological SWCNT Plasmonic Microtoroid

• URL: http://arxiv.org/abs/2603.29290v1
• Date: Tue, 31 Mar 2026 05:50:31 GMT
• Title: Entanglement between an NV Center and Chiral Photons in a Topological SWCNT Plasmonic Microtoroid
• Abstract summary: We propose a hybrid solid-state quantum node based on a single nitrogen-vacancy center and a single-walled carbontube nano (SWCNT) plasmonic microtoroid.<n>We derive the cavity spectrum, the chiral selection rules, the effective tripod Hamiltonian, and the open-system master equation.
• Score: 1.9798034349981162
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a theoretical proposal for a hybrid solid-state quantum node based on a single nitrogen-vacancy (NV) center coupled to a topological single-walled carbon nanotube (SWCNT) plasmonic microtoroid. The SWCNT ring supports deeply sub-wavelength whispering-gallery-like plasmonic modes that are naturally described within a Tomonaga-Luttinger liquid framework. Owing to the closed-ring topology, the cavity spectrum contains a zero-mode sector that is tunable by an external magnetic flux through an Aharonov-Bohm shift. We show that the strongly confined CNT near field can exhibit chiral spin-momentum locking, enabling the two circularly polarized NV transitions to couple selectively to clockwise and counter-clockwise cavity modes, while the parasitic linearly polarized $π$-transition is strongly suppressed by the pronounced anisotropy of the local Purcell enhancement. Based on a tripod stimulated Raman adiabatic passage (STIRAP) scheme, the system can in principle map the NV spin onto a spin-photon entangled state in a deterministic manner, which is then emitted into a side-coupled tapered optical fiber as a tunable flying qubit. We derive the cavity spectrum, the chiral selection rules, the effective tripod Hamiltonian, and the open-system master equation. Quantitative estimates indicate that, under cryogenic conditions and in the overcoupled regime, high-fidelity spin-photon entanglement and in situ magnetic tuning of the emitted photon frequency are in principle achievable. We also discuss a realistic fabrication route for the CNT resonator and deterministic positioning strategies for a single NV center in the CNT near field.

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