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This research presents a novel ancilla-assisted dark-state mechanism for implementing high-fidelity entangling gates using optically trapped ultracold polar molecules. By driving only the ancilla qubit, the study demonstrates a scalable pathway to multi-qubit operations essential for circuit-based quantum computing architectures. The work addresses critical challenges in gate fidelity and scalability within a leading hardware platform for quantum information processing.
Ancilla-assisted dark-state quantum gates in ultracold polar molecules
arXiv:2609.18972v1 Announce Type: new Abstract: High-fidelity entangling gates are useful for circuit-based quantum computing, yet their realization in a scalable platform is challenging. Optically trapped ultracold polar molecules offer a potentially scalable platform. Here, we introduce a two-qubit molecular entangling gate via a novel ancilla-assisted dark-state mechanism, where high fidelity is achievable. In particular, we find that by using appropriate qubit states for the ancilla and the data qubits, dark states can appear, and entanglement can emerge by driving the ancilla only. It is also feasible to extend the two-qubit gate to a multi-qubit gate via the same dark-state mechanism.
Abstract:High-fidelity entangling gates are useful for circuit-based quantum computing, yet their realization in a scalable platform is challenging. Optically trapped ultracold polar molecules offer a potentially scalable platform. Here, we introduce a two-qubit molecular entangling gate via a novel ancilla-assisted dark-state mechanism, where high fidelity is achievable. In particular, we find that by using appropriate qubit states for the ancilla and the data qubits, dark states can appear, and entanglement can emerge by driving the ancilla only. It is also feasible to extend the two-qubit gate to a multi-qubit gate via the same dark-state mechanism.
Quantum Physics (quant-ph); Applied Physics (physics.app-ph); Atomic Physics (physics.atom-ph)
arXiv:2609.18972 [quant-ph]
(or arXiv:2609.18972v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2609.18972 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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