Optimized emulation of quantum magnetometry via superconducting qubits

Gusarov, N. N.; Perelshtein, M. R.; Hakonen, P. J.; Paraoanu, G. S.

doi:10.1103/physreva.107.052609

Cited by 2 publications

(1 citation statement)

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“…Our approach can be applied to the encoding of structured data, such as images [41,65] and videos [56], into quantum circuits. Besides, our method can be utilized to prepare quantum states for sensing to maximise the detection efficiency [66,67]. A more detailed explanation of these applications is given in appendix C.…”

Section: Discussionmentioning

confidence: 99%

Quantum state preparation using tensor networks

Melnikov

Alena

Dolgov

et al. 2023

Quantum Sci. Technol.

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Quantum state preparation is a vital routine in many quantum algorithms, including solution of linear systems of equations, Monte Carlo simulations, quantum sampling, and machine learning. However, to date, there is no established framework of encoding classical data into gate-based quantum devices. In this work, we propose a method for the encoding of vectors obtained by sampling analytical functions into quantum circuits that features polynomial runtime with respect to the number of qubits and provides >99.9% accuracy, which is better than a state-of-the-art two-qubit gate fidelity. We employ hardware-efficient variational quantum circuits, which are simulated using tensor networks, and matrix product state representation of vectors. In order to tune variational gates, we utilize Riemannian optimization incorporating auto-gradient calculation. Besides, we propose a ”cut once, measure twice” method, which allows us to avoid barren plateaus during gates’ update, benchmarking it up to 100-qubit circuits. Remarkably, any vectors that feature low-rank structure – not limited by analytical functions – can be encoded using the presented approach. Our method can be easily implemented on modern quantum hardware, and facilitates the use of the hybrid-quantum computing architectures.

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