Generation of tomographic measurement data of mesoscopic quantum states

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73631428" target="_blank" >RIV/61989592:15310/25:73631428 - isvavai.cz</a>
Result on the web
<a href="https://opg.optica.org/directpdfaccess/243863e3-e373-4220-86f4b55f4c5ca0a6_574775/opticaq-3-4-360.pdf" target="_blank" >https://opg.optica.org/directpdfaccess/243863e3-e373-4220-86f4b55f4c5ca0a6_574775/opticaq-3-4-360.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1364/OPTICAQ.562217" target="_blank" >10.1364/OPTICAQ.562217</a>

Result language
angličtina
Original language name
Generation of tomographic measurement data of mesoscopic quantum states
Original language description
Microscopic Schrödinger cat states are generated from quantum-correlated fields using a probabilistic heralding photon subtraction event. Subsequent quantum state tomography provides complete information about the state, revealing numbers of quantum-correlated photons of the order of one. Optical quantum computing requires even more sophisticated states with significantly higher photon numbers. Here, we present a concept to derive tomographic “measurement” data of states with average quantum-correlated photon numbers significantly larger than one without having these states available. We generate a photon-subtracted squeezed vacuum state of light and simultaneously measure a pair of orthogonal field quadratures. Subsequent data post-processing emulates the optical interference of two copies. One of the interference results is accepted as the new “measurement” value if the second interference result falls below a threshold value. Evaluating the final tomographic data shows that two iterations of the breeding protocol increase the mean photon number of the state from ≈ 1 to ≈ 4. Our concept for obtaining tomographic measurement data of mesoscopic non-classical states that physically never existed provides a way to benchmark future quantum technologies.
Czech name
—
Czech description
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Project
<a href="/en/project/GA21-23120S" target="_blank" >GA21-23120S: Quantum filters for engineering optical quantum states and operations</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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