Rokni Mordechai

Job/Title:

Professor

Primary Category:

Emeriti

Discipline:

Nonlinear

Office:

Danciger B 119

Phone:

02 6584 497

E-Mail:

Upcoming Events

Monday, December 30th

Physics Colloquium : ""
- Start time: 12:00pm
- End date: Monday, December 30th
- End time: 01:30pm
- Lecturer: Avi Zadok, Bar IlanAbstract:
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Tuesday, December 31st

Weekly Seminar Quantum Center:"New Avenues for Quantum Information Processing with Light-Matter Interactions"
- Start time: 11:45am
- End date: Tuesday, December 31st
- End time: 01:15pm
- Lecturer: Aviv Karnieli, Stanford UniversityAbstract:Light-matter interaction (LMI) underpins numerous quantum technologies, yet persistentchallenges—such as decoherence, scalability, and speed—limit the advancement ofquantum information processing (QIP) in this promising platform. These limitationsmotivate the search for alternative quantum hardware leveraging LMI to overcomethese barriers and unveil new opportunities for QIP.In this seminar, I will demonstrate how combining diverse concepts, components, andbuilding blocks in quantum optics leads to such novel approaches for QIP. First, I willintroduce free electrons as a new and promising resource in quantum optics, enablingultrafast operation, strong coupling, and single-photon nonlinearities in cavity quantumelectrodynamics (QED). Next, I will show how the integration of concepts from nonlinearoptics into waveguide QED unlocks novel schemes for many-body entanglementgeneration and enables access to exotic physics in atomic arrays. Finally, I will presenta scalable architecture for processing high-dimensional photonic entanglement, inspiredby the variational principle in physics and realized through self-configuring photonicnetworks.Karnieli*, Tsesses*, et al PRX Quantum 5, 010339 (2024)Karnieli and Fan, Science Advances 9, eadh2425 (2023)Karnieli*, Roques-Carmes*, et al, ACS Photonics 11, 3401 (2024)Karnieli et al, accepted to Physical Review Research (2024)Roques-Carmes*, Karnieli* et al, arXiv:2407.16849 (2024)Karnieli*, Roques-Carmes*, et al (submitted to CLE0 2025)
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Astrolunch: Jonathan Katz
- Start time: 12:30pm
- End date: Tuesday, December 31st
- End time: 01:30pm
- Contact: Tsvi Piran
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Wednesday, January 1st

Nonlinear Physics seminar: "Electrolytes in bulk and at interfaces: a short review and recent developments"
- Start time: 12:00pm
- End date: Wednesday, January 1st
- End time: 01:30pm
- Lecturer: David Andelman, School of Physics, Tel Aviv University, Israel Abstract:The Poisson-Boltzmann theory stems from the pioneering works of Debye and Onsager and isconsidered even today as the benchmark of ionic solutions and electrified interfaces. It hasbeen instrumental during the last century in predicting charge distributions and interactionsbetween charged surfaces, membranes, electrodes, macromolecules, and colloids. Theelectrostatic model of charged fluids, on which the Poisson-Boltzmann description rests and itsstatistical mechanical consequences have been scrutinized in great detail. Much less, however,is understood about its probable shortcomings when dealing with various aspects of realphysical, chemical, and biological systems. After reviewing the Poisson-Boltzmann theory, I willdiscuss several recent extensions and modifications as applied to ions and macromolecules insolutions. These novel ideas include the effect of dipolar solvent molecules, finite size of ions,ionic specificity, surface tension, charge regulation of ionizable groups and conductivity ofconcentrated ionic solutions.
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Special Seminar Quantum Center:"Quantum measurement through parametric amplification"
- Start time: 02:30pm
- End date: Wednesday, January 1st
- End time: 04:00pm
- Lecturer: Prof. Maria Chekhova, Max-Planck Institute for the Science of Light Erlangen, GermanyAbstract:Quantum states of light are central to photonic quantum technologies, which makes their measurement very important. But quantum states are extremely fragile. Fortunately, a nonlinear-optical device known as the optical parametric amplifier comes to rescue when measurement over a fragile quantum state is needed. It protects the measurement against optical losses and imperfect detection, enables addressing several modes simultaneously, and can substitute homodyne detection with direct detection.
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Rokni Mordechai