סמינר מחלקה אלקטרוניקה פיזיקאלית: Dr. Ofer Kfir

20 ביוני 2019, 15:00 
פקולטה להנדסה, בניין כיתות, חדר 011 
סמינר מחלקה אלקטרוניקה פיזיקאלית:  Dr. Ofer Kfir

You are invited to attend a lecture

Entanglements between free-electrons and photons in electron-microscopes.
By:
Dr. Ofer Kfir
4th Physical Institute and Institute for X-ray Physics, Georg-August-University of Göttingen

Abstract
Quantum communication combines deep physical concepts with practical applications, such as the use of photon-entanglement for quantum key distribution. Mankind's immense toolkit for photonics allowed to pursue these capabilities even in space [1]. The concept of space telecommunication brings about an opportunity to harness beneficial properties of other fundamental particles, e.g. electrons. Although in its infancy, laser control of electron beams is improving rapidly, with the formation of attosecond electron-pulses as a prime example [2,3]. However, due to the weak electron-photon couplings and the rapid decoherence of optical excitations in typical samples, their entanglement has never been observed.
My talk will discuss the regime of strong-coupling between electrons and whispering-gallery-mode (WGM) photons, describe their expected entanglement properties, and propose an experimental road-map to approach this regime. I will discuss the possibility to create in the lab an entangled electron-photon pair, similar to a polarization-based photonic Bell-state. Similarly, cascading the strong coupling may enable the entanglement of a pair of electrons. Importantly, this model yields the known electron-spectra in the weak-coupling limit. I will show two experimental results in this spirit: probing electron coupling to whispering-gallery modes in a glass sphere, and the effect of the photon chirality on its coupling to electrons, when the interaction is mediated by a chiral nanostructure. As fundamental particles distinctly different from photons, electrons offer a variety of new useful properties, such as a superior beam-divergence, and controlability with electric and magnetic fields. In the future, the ability to imprint quantum-optical states on relativistic electron-beams may enable the use of electrons as information carriers, entangled to the already mature photonics technology.

On Thursday, June 20, 2019, 15:00
Room 011, Kitot building

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