Colloquia


Colloquia

Due to the current situation (COVID-19), the guest lectures of the MPQ Colloquium will only take place online until further notice. Details on participation will be sent via the mailing lists [wiss-mpq] and [Mpq-colloquium-stream]. Please register using the adjacent link.


Scientific organization of the talks:  Dr. Stephan Dürr and Dr. Thomas Udem

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Location: Max-Planck-Institut für Quantenoptik

Parity Measurements in Action: Detecting Errors in the Surface Code and Heralding Itinerant Cat States using Superconducting Circuits (Prof.Christopher Eichler)

Parity Measurements in Action: Detecting Errors in the Surface Code and Heralding Itinerant Cat States using Superconducting Circuit
Parity measurements distinguish between quantum states with an even and an odd number of excitations without revealing any additional information about the state. Nondestructive parity detection allows one to project onto highly entangled states and therefore plays a central role in quantum error correction. [more]

Topological Superconductivity and Majorana Fermions in Coupled Wires (Fan Yang)

Topological Superconductivity and Majorana Fermions in Coupled Wires
In the first part, we present a theoretical study of the interplay between topological p-wave superconductivity, orbital magnetic fields and quantum Hall phases in coupled wire systems. We consider two-dimensional systems made of weakly coupled ladders. There, we engineer a p+ip superconductor with the chiral Majorana edge current and describe a generalization of the ν = 1/2 fractional quantum Hall phase. These phases might be realized in solid-state or cold-atom nanowires. For the second part, we will address the spin ladder analogs of the Kitaev honeycomb model. A generalized phase diagram for the two-leg ladder system is obtained together with a driven time-dependent protocol based on superconducting box circuits. [more]

Complexity in quantum field theory (Dr. Michal Heller)

Complexity in quantum field theory
Recent developments in holography (AdS/CFT) has led to a conjecture that spacetime volume inside a black hole is related to complexity in a dual quantum field theory. This development has provided strong stimulous for understanding definitions and properties of complexity in quantum field theory and I will review some of the results in this emerging area. [more]

Quantum Computing NISQ Era and beyond

Quantum Computing NISQ Era and beyond
Noisy Intermediate-Scale Quantum (NISQ) technology will be available in the near future. Quantum computers with 50-100 qubits may be able to perform tasks which surpass the capabilities of today's classical digital computers, but noise in quantum gates will limit the size of quantum circuits that can be executed reliably [more]

Towards Highly Storage Efficiency of Optical Quantum Memory Based on Electromagnetically Induced Transparency Protocol

Towards Highly Storage Efficiency of Optical Quantum Memory Based on Electromagnetically Induced Transparency Protocol
Long-distance quantum communication based on quantum repeater protocol [more]
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