Nonlinear Spectroscopy via Generalized Quantum Phase Estimation

• URL: http://arxiv.org/abs/2405.13885v1
• Date: Wed, 22 May 2024 18:00:01 GMT
• Title: Nonlinear Spectroscopy via Generalized Quantum Phase Estimation
• Authors: Ignacio Loaiza, Danial Motlagh, Kasra Hejazi, Modjtaba Shokrian Zini, Alain Delgado, Juan Miguel Arrazola,
• Abstract summary: Response theory has a successful history of connecting experimental observations with theoretical predictions. The calculation of response properties for quantum systems is often expensive, especially for nonlinear spectroscopy. In this work, we introduce a generalized quantum phase estimation framework. This allows the treatment of general correlation functions enabling the recovery of response properties of arbitrary orders.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Response theory has a successful history of connecting experimental observations with theoretical predictions. Of particular interest is the optical response of matter, from which spectroscopy experiments can be modelled. However, the calculation of response properties for quantum systems is often prohibitively expensive, especially for nonlinear spectroscopy, as it requires access to either the time evolution of the system or to excited states. In this work, we introduce a generalized quantum phase estimation framework designed for multi-variate phase estimation. This allows the treatment of general correlation functions enabling the recovery of response properties of arbitrary orders. The generalized quantum phase estimation circuit has an intuitive construction that is linked with a physical process of interest, and can directly sample frequencies from the distribution that would be obtained experimentally. In addition, we provide a single-ancilla modification of the new framework for early fault-tolerant quantum computers. Overall, our framework enables the efficient simulation of spectroscopy experiments beyond the linear regime, such as Raman spectroscopy. This opens up an exciting new field of applications for quantum computers with potential technological impact.

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