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• W4386443796 abstract "State-of-the-art noisy digital quantum computers can only execute short-depth quantum circuits. Variational algorithms are a promising route to unlock the potential of noisy quantum computers since the depth of the corresponding circuits can be kept well below hardware-imposed limits. Typically, the variational parameters correspond to virtual ${R}_{Z}$ gate angles, implemented by phase changes of calibrated pulses. By encoding the variational parameters directly as hardware pulse amplitudes and durations, we succeed in further shortening the pulse schedule and overall circuit duration. This decreases the impact of qubit decoherence and gate noise. As a demonstration, we apply our pulse-based variational algorithm to the calculation of the ground state of different hydrogen-based systems (${mathrm{H}}_{2}, {mathrm{H}}_{3}$, and ${mathrm{H}}_{4}$) using IBM cross-resonance-based hardware. We observe a reduction in schedule duration of up to $5ifmmodetimeselsetexttimesfi{}$ compared to cnot-based Ansatze, while also reducing the measured energy. In particular, we observe a sizable improvement of the minimal energy configuration of ${mathrm{H}}_{3}$ compared to a cnot-based variational form. Finally, we discuss possible future developments including error-mitigation schemes and schedule optimizations, which will enable further improvements of our approach, paving the way towards the simulation of larger systems on noisy quantum devices." @default.
• W4386443796 created "2023-09-06" @default.
• W4386443796 creator A5001223912 @default.
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• W4386443796 date "2023-09-05" @default.
• W4386443796 modified "2023-10-01" @default.
• W4386443796 title "Pulse variational quantum eigensolver on cross-resonance-based hardware" @default.
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• W4386443796 doi "https://doi.org/10.1103/physrevresearch.5.033159" @default.
• W4386443796 hasPublicationYear "2023" @default.
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