CMSP Seminar Series @ICTP Stasi ROOM: B. VERMERSCH Thursday 16 March at 11:30

[Condensed Matter Section]

ICTP Seminar Series in Condensed Matter and Statistical Physics
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Thursday 16 March at 11:30 a.m.

Luigi Stasi Seminar Room, first floor, ICTP Leonardo building
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Speaker:
Benoit VERMERSCH ( IQOQI, Innsbruck, Austria)

Title:
Quantum Optics of Chiral Networks with Atoms, Photons and Spins

Abstract:

Chiral Networks consist of nodes (for instance two-level atoms), coupled 
to chiral waveguides. By chiral coupling we mean an asymmetric coupling 
of the nodes to the left and right propagating guided modes. Chiral 
networks can also be realized using two-dimensional topological 
materials with spins or photons.

Remarkably, the driven dissipative dynamics of the network can be 
described by a chiral Master Equation, which predicts steady states in 
form of pure states consisting of quantum dimers.

Quantum networks have also applications is the context of Quantum 
information. In this talk, I will present two results showing how to 
achieve robust Quantum Communication protocols between two nodes of an 
imperfect, "dirty", chiral quantum network.

I will first present a model of topologically protected chiral quantum 
network, which can be realized with Rydberg atoms, and show how to 
achieve Quantum Communication in the presence of defects.

In a second part, I will discuss the effect of noise in Quantum 
networks. I will present a new protocol which allows faithful transfer 
of quantum states between two distant cavities of a quantum network 
connected by a noisy waveguide. This is a result of the linearity of the 
overall system (as coupled harmonic oscillators), which allows injected 
noise propagating ballistically in the waveguide, and acting on both 
cavities to drop out by quantum interference. Our proposed protocol and 
quantum optical setups can be realized with state of the art 
experimental techniques in both photonic and phononic quantum circuits.

P Lodahl 2017 Nature 541, 473œ480
C Dlaska /et al/ 2017 /Quantum Sci. Technol./ *2* 015001
B Vermersch et al 2017 arXiv:1611.10240 <https://arxiv.org/abs/1611.10240>