Photonic quantum metrology with variational quantum optical non-linearities

• URL: http://arxiv.org/abs/2309.09841v2
• Date: Wed, 7 Feb 2024 08:29:51 GMT
• Title: Photonic quantum metrology with variational quantum optical non-linearities
• Authors: A. Mu\~noz de las Heras, C. Tabares, J. T. Schneider, L. Tagliacozzo, D. Porras and A. Gonz\'alez-Tudela
• Abstract summary: Photonic quantum metrology harnesses quantum states of light to measure unknown parameters beyond classical precision limits. Current protocols suffer from two severe limitations that preclude their scalability. Here, we develop a deterministic protocol combining quantum optical non-linearities and variational quantum algorithms.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Photonic quantum metrology harnesses quantum states of light, such as NOON or Twin-Fock states, to measure unknown parameters beyond classical precision limits. Current protocols suffer from two severe limitations that preclude their scalability: the exponential decrease in fidelities (or probabilities) when generating states with large photon numbers due to gate errors, and the increased sensitivity of such states to noise. Here, we develop a deterministic protocol combining quantum optical non-linearities and variational quantum algorithms that provides a substantial improvement on both fronts. First, we show how the variational protocol can generate metrologically-relevant states with a small number of operations which does not significantly depend on photon-number, resulting in exponential improvements in fidelities when gate errors are considered. Second, we show that such states offer a better robustness to noise compared to other states in the literature. Since our protocol harnesses interactions already appearing in state-of-the-art setups, such as cavity QED, we expect that it will lead to more scalable photonic quantum metrology in the near future.

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