TY - JOUR

T1 - Shifting physics of vortex particles to higher energies via quantum entanglement

AU - Karlovets, D. V.

AU - Baturin, S. S.

AU - Geloni, G.

AU - Sizykh, G. K.

AU - Serbo, V. G.

N1 - We are grateful to A. Di Piazza, A. Chaikovskaia, A. Tishchenko, A. Surzhykov, A. Pupasov-Maksimov, and A. Volotka for fruitful discussions and criticism. The studies in Sects. , are supported by the Russian Science Foundation (Project No. 21-42-04412; https://rscf.ru/en/project/21-42-04412/ ). The studies in Sect. are supported by the Ministry of Science and Higher Education of the Russian Federation (agreement No.075-15-2021-1349). The studies in Sect. are supported by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program. The work on the evolved states of particles (by D. Karlovets and G. Sizykh) was supported by the Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS”.

PY - 2023/5

Y1 - 2023/5

N2 - Physics of structured waves is currently limited to relatively small particle energies as the available generation techniques are only applicable to the soft X-ray twisted photons, to the beams of electron microscopes, to cold neutrons, or non-relativistic atoms. The highly energetic vortex particles with an orbital angular momentum would come in handy for a number of experiments in atomic physics, nuclear, hadronic, and accelerator physics, and to generate them one needs to develop alternative methods, applicable for ultrarelativistic energies and for composite particles. Here, we show that the vortex states of in principle arbitrary particles can be generated during photon emission in helical undulators, via Cherenkov radiation, in collisions of charged particles with intense laser beams, in such scattering or annihilation processes as eμ→ eμ, ep→ ep, e-e+→ pp¯ , and so forth. The key element in obtaining them is the postselection protocol due to entanglement between a pair of final particles and it is largely not the process itself. The state of a final particle – be it a γ -ray, a hadron, a nucleus, or an ion – becomes twisted if the azimuthal angle of the other particle momentum is measured with a large error or is not measured at all. As a result, requirements to the beam transverse coherence can be greatly relaxed, which enables the generation of highly energetic vortex beams at accelerators and synchrotron radiation facilities, thus making them a new tool for hadronic and spin studies.

AB - Physics of structured waves is currently limited to relatively small particle energies as the available generation techniques are only applicable to the soft X-ray twisted photons, to the beams of electron microscopes, to cold neutrons, or non-relativistic atoms. The highly energetic vortex particles with an orbital angular momentum would come in handy for a number of experiments in atomic physics, nuclear, hadronic, and accelerator physics, and to generate them one needs to develop alternative methods, applicable for ultrarelativistic energies and for composite particles. Here, we show that the vortex states of in principle arbitrary particles can be generated during photon emission in helical undulators, via Cherenkov radiation, in collisions of charged particles with intense laser beams, in such scattering or annihilation processes as eμ→ eμ, ep→ ep, e-e+→ pp¯ , and so forth. The key element in obtaining them is the postselection protocol due to entanglement between a pair of final particles and it is largely not the process itself. The state of a final particle – be it a γ -ray, a hadron, a nucleus, or an ion – becomes twisted if the azimuthal angle of the other particle momentum is measured with a large error or is not measured at all. As a result, requirements to the beam transverse coherence can be greatly relaxed, which enables the generation of highly energetic vortex beams at accelerators and synchrotron radiation facilities, thus making them a new tool for hadronic and spin studies.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85159958914&origin=inward&txGid=45922190ee778824119f4a7dac574feb

UR - https://www.mendeley.com/catalogue/0792e097-e1d3-3058-be7f-b02f248957f1/

U2 - 10.1140/epjc/s10052-023-11529-4

DO - 10.1140/epjc/s10052-023-11529-4

M3 - Article

VL - 83

JO - European Physical Journal C

JF - European Physical Journal C

SN - 1434-6044

IS - 5

M1 - 372

ER -