Seminare

A source of light-matter entanglement for quantum state distribution over hybrid matter platforms (Dr. Pau Farrera)

A source of light-matter entanglement for quantum state distribution over hybrid matter platforms

Datum: 21.11.2018
Uhrzeit: 13:30
Vortragende(r): Dr. Pau Farrera
Ort: Max-Planck-Institut für Quantenoptik
Raum: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
Gastgeber: MPQ, Quantum Dynamics Division

In this talk I will speak about our source of light-matter quantum states based on laser-cooled atoms. In particular, I will explain the capabilities developed in order to transfer photonic qubits from this system to another matter platform that consists on a crystal doped with rare-earth ions. Photonic qubits generated by the atomic cloud were frequency converted and temporally shaped in order to have an optimum interaction with the ions in the crystal. These capabilities enabled to perform quantum state transfer between these two very different matter systems: the laser-cooled gas and the crystal. [mehr]

Entanglement Renormalization for Weakly Interacting Fields (Ali Mollabashi)

Entanglement Renormalization for Weakly Interacting Fields

Datum: 14.11.2018
Uhrzeit: 10:30
Vortragende(r): Ali Mollabashi
Max-Planck-Institut für Physik, München
Ort: Max-Planck-Institut für Quantenoptik
Raum: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
Gastgeber: MPQ, Theory Division

I will introduce a specific method how to generalize cMERA in presence of interactions. The method is based on Hamiltonian renormalization of spatial degrees of freedom. Using this method I will work out a circuit starting from an appropriate IR state and ending up with the vacuum state of phi^4 theory. [mehr]

IMPRS-APS Talk: Ultrafast electron control: from the particle accelerator on a chip to attosecond charge transfer in a Schottky junction (Prof. Dr. Hommelhoff)

Ultrafast electron control: from the particle accelerator on a chip to attosecond charge transfer in a Schottky junction

Datum: 08.11.2018
Uhrzeit: 11:30 - 13:00
Vortragende(r): Prof. Dr. Peter Hommelhoff
University of Erlangen
Ort: Max-Planck-Institut für Quantenoptik
Raum: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
Gastgeber: IMPRS-APS

Firstly, I will deal with a new way of accelerating charged particles based on femtosecond laser pulses and nanophotonic structures. The concept is exactly the same as in classical RF and microwave accelerators, only with roughly five orders of magnitude faster oscillating driving fields and structures that are smaller by the same factor. With the help of such small lithographically produced dielectric structures we have demonstrated not only efficient acceleration of electrons, but also deflection and focusing. Currently, we are building a prototype "accelerator on a chip". The current status will be reported. [mehr]

Arrival time distributions and spin in quantum mechanics-A Bohmian perspective (Siddhant Das)

Datum: 07.11.2018
Uhrzeit: 10:30
Vortragende(r): Siddhant Das
Ludwig-Maximilians-Universität (LMU) München
Ort: Max-Planck-Institut für Quantenoptik
Raum: New Lecture Hall, Room B 0.32
Gastgeber: MPQ, Theory Division

The arrival time statistics of spin-1/2 particles governed by Pauli's equation, and defined by their Bohmian trajectories, show unexpected and very well articulated features. Comparison with other proposed statistics of arrival times that arise from either the usual (convective) quantum flux or from semiclassical considerations suggests testing the notable deviations in an arrival time experiment, thereby probing the predictive power of Bohmian trajectories. The suggested experiment, including the preparation of the wave functions, could be done with present-day experimental technology. [mehr]

Quantum simulations of non-equilibrium dynamics with ion spin chains (Jiehang Zhang)

Datum: 30.10.2018
Uhrzeit: 11:30 - 13:00
Vortragende(r): Jiehang Zhang
Joint Quantum Institute of the University of Maryland
Ort: Max-Planck-Institut für Quantenoptik
Raum: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
Gastgeber: MPQ, Theory Division

Trapped ions are ideal candidates for engineering quantum systems with individual resolution. Qubits are encoded with the internal levels of the ions, and controlled with laser-driven interactions. Such a system present an excellent coherence time and can find wide applications in quantum simulations and quantum computing. [mehr]