Optical Time-Domain Quantum State Tomography on a Subcycle Scale
Physical Review X, vol. 14
Abstract
Following recent progress in the experimental application of electro-optic sampling to the detection of the quantum fluctuations of the electromagnetic-field ground state and ultrabroadband squeezed states on a subcycle scale, we propose an approach to elevate broadband electro-optic sampling from a spectroscopic method to a full quantum tomography scheme, able to reconstruct a free-space quantum state directly in the time domain. By combining two recently developed methods to theoretically describe quantum electro-optic sampling, we analytically relate the photon-count probability distribution of the electro-optic signal to a transformed phase-space quasiprobability distribution of the sampled quantum state as a function of the time delay between the sampled midinfrared pulsed state and an ultrabroadband near-infrared probe pulse. We catalog and analyze sources of noise and show that in quantum electro-optic sampling with an ultrabroadband probe pulse one can expect to observe thermalization due to entanglement breaking. Mitigation of the thermalization noise enables a tomographic reconstruction of broadband quantum states while granting access to its dynamics on a subcycle scale. Published by the American Physical Society 2024
Authors 3
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Affiliation as printed
University of Konstanz
Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
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RWTH Aachen University · Forschungszentrum Jülich · University of Konstanz
Affiliation as printed
Forschungszentrum Jülich
RWTH Aachen University
University of Konstanz
Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
Institute for Quantum Information, RWTH Aachen University, D-52056 Aachen, Germany
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Affiliation as printed
University of Konstanz
Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
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