Entanglement Witnesses of Condensation for Enhanced Quantum Sensing

• URL: http://arxiv.org/abs/2511.17749v2
• Date: Tue, 25 Nov 2025 21:42:34 GMT
• Title: Entanglement Witnesses of Condensation for Enhanced Quantum Sensing
• Authors: Lillian I. Payne Torres, Irma Avdic, Anna O. Schouten, Olivia C. Wedig, Gregory S. Engel, David A. Mazziotti,
• Abstract summary: We show that collective entanglement of spin qubits can amplify transitions between ground and excited spin states.<n>Results offer a design principle for quantum sensors that exploit condensation-inspired entanglement to boost sensitivity in spin-based platforms.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum phenomena such as entanglement provide powerful resources for enhancing classical sensing. Here, we theoretically show that collective entanglement of spin qubits, arising from a condensation of particle-hole pairs, can strongly amplify transitions between ground and excited spin states, potentially improving signal contrast in optically detected magnetic resonance. This collective state exhibits an $\mathcal{O}(\sqrt{N})$ enhancement of the transition amplitude with respect to an applied microwave field, where $N$ is the number of entangled spin qubits. We computationally realize this amplification using an ensemble of $N$ triplet spins with magnetic dipole interactions, where the largest transition amplitudes occur at geometries for which the condensation of particle-hole pairs is strongest. This effect, robust to noise, originates from the concentration of entanglement into a single collective mode, reflected in a large eigenvalue of the particle-hole reduced density matrix -- an entanglement witness of condensation analogous to off-diagonal long-range order, though realized here in a finite system. These results offer a design principle for quantum sensors that exploit condensation-inspired entanglement to boost sensitivity in spin-based platforms.

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