> BEGIN:VCALENDAR VERSION:2.0 PRODID:-//WISTA Management GmbH/ METHOD:PUBLISH X-MS-OLK-FORCEINSPECTOROPEN:TRUE BEGIN:VTIMEZONE TZID:W. Europe Standard Time BEGIN:STANDARD DTSTART:16011028T030000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010325T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT UID:50077 LOCATION:newsItem.organizer.description , Newtonstraße 15, 12489 Berlin Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal CREATED:20240315T092730Z DTSTAMP:20260120T125111Z SUMMARY:Physik-Kolloquium DESCRIPTION: X-ALT-DESC;FMTTYPE=text/html:

Why photons? A psychoanalytic portrait of a scientist as a mature man
– Special Colloquium together with MBI –

Prof. Dr. Maciej Lewenstein (ICFO, Barcelona)

I will start with the origins: Maxwell theory, present five reasons to quantize, or maybe four? I will then discuss quantum theory of optical coherence, answering the question:  How to reconcile Maxwell with photons? I will describe shortly coherent states and squeezed states. I will then turn to strong field physics, starting with a historical introduction and description of the present times, where semi-classical theory is sufficient. I will then mention the generation of Schrödinger cat states within atto-physics, answering the question: yes, we do need photons. At the end, I will discuss three mechanisms to exhibit quantumness of EM fields: i) Conditioning/post selection + applications; ii) Nonlinear effects induced by depletion/interband transitions, or dipole correlations; iii) Use quantum fields.

 

The Colloquium will be held in “hybrid” form. You can either join in person or via zoom.

Zoom Link

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