Quantum Science Seminar #33 - Young Researchers

This week in the Quantum Science Seminar: The three young researchers Jessie Zhang, Ryan Macdonnell and Gonzalo Carvacho

January 28, 2021
Jessie Zhang (Harvard University), Ryan Macdonnell (University of Sydney) and Gonzalo Carvacho (Sapienza Università di Roma)

Jessie Zhang about "Assembly of a single rovibrational ground state molecule in an optical tweezer"

Ultracold molecules hold promise for various quantum science applications that could utilize their long-range dipole-dipole interactions and rich internal structures. Trapping and manipulating molecules in optical tweezers offer many advantages due to their high level of controllability. In this talk, I will discuss our recent results in forming a single NaCs molecule in its rovibrational ground state starting from a pair of atoms in an optical tweezer. This is achieved by first magnetoassociating into a Feshbach molecule and then applying a Raman pulse which gives rise to coherent Rabi oscillations between the ground state. Our work opens up exciting possibilities with fully quantum-state-controlled molecules in optical tweezer arrays.

Ryan Macdonnell about "Analog quantum simulation of chemical dynamics"

Quantum chemical simulation is a challenging task for classical computers due to the rapid growth of information with system size. Quantum computing techniques may alleviate this issue, but to date demonstrations have been limited to static properties of small systems. We show how analog quantum simulation can be used to study chemical dynamics governed by vibronic coupling Hamiltonians. Our approach uses an optimal, linear mapping of vibrational modes and electronic states of the molecule onto bosonic modes and internal states of the simulator. In addition, we show how our approach readily extends to large, open-quantum systems, all using existing technology.

Gonzalo Carvacho about "Experimental violation of n-locality in a star quantum network"
Nonlocality in networks with independent entanglement sources has only been experimentally verified in simple tripartite networks, via the violation of bilocality inequalities. Here, by using a scalable photonic platform, we implement star-shaped quantum networks consisting of up to five distant nodes and four independent entanglement sources. We exploit this platform to violate the chained n-locality inequality and thus witness, in a device-independent way, the emergence of nonlocal correlations among the nodes of the implemented networks. These results open new perspectives for quantum information processing applications.

Access the live talk at 5 p.m. CET or the recording afterwards via this link:

https://www.youtube.com/channel/UCYfq48NHj6zbudywnLW3aYw

Here you can find the recording of the last lecture, Ulrich Schneider about "Optical Quasicrystals—Quantum Simulations beyond periodic systems"

Quantum Science Seminar #32 - Ulrich Schneider

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