Several PostDoc positions are available at IFIC (University of Valencia and CSIC). Possible topics reflect the research interests of groups at IFIC, including quantum information theory. More information:

https://academicjobsonline.org/ajo/jobs/23480

Bulk acoustic-wave resonators: from quantum control to tests of new physics

Mechanical resonators are emerging as an important new platform for quantum science and technologies. Proposals for using them to store, process, and transduce quantum information motivate the development of increasingly sophisticated techniques for controlling mechanical motion in the quantum regime. By interfacing mechanical resonators with superconducting circuits, circuit quantum acoustodynamics can make a variety of important tools available for manipulating and measuring motional quantum states. In this talk, I will show direct measurements of phonon number distributions, parities, and Wigner functions of nonclassical mechanical states, which are achieved by operating our system in the strong dispersive regime. Moreover, I’ll explain how these tools can be exploited to test theories beyond quantum mechanics, such as Planck-scale physics modifications and wave function-collapse models.

A PhD position will be available at the University of Valencia in the field of quantum information and quantum technologies, starting in fall 2022.

The planned research addresses the intersection of quantum information theory and the development of quantum technologies. This includes the development of new tools for quantum metrology, the characterization of quantum correlations, and possibly applications in quantum optical systems of light or atoms.

Interested candidates are encouraged to contact Manuel Gessner.

Our activities will continue after the summer break at the University of Valencia. There will be funding for a PhD position.

Eigenstate structure and quantum chaos in a system of interacting bosons

We discuss the characterization of the eigenstate structure in Hilbert space for systems of interacting particles borrowing the tools from multifractal analysis, and apply it to study the Bose-Hubbard hamiltonian. We show that this formalism offers a different perspective of the Mott insulator to superfluid ground state phase transition [1], and unveils unambiguously the emergence of quantum chaos in the excitation spectrum of the system [2,3,4]. The chaotic phase is identified by the energy-resolved correlation between spectral features and structural changes of the associated eigenstates, and benchmarked against the universal predictions of random matrix theory (RMT). While the typical eigenstate structure is remarkably well captured by RMT, we demonstrate that the distinctiveness of the many-body hamiltonian in the chaotic phase remains accessible as the thermodynamic limit is approached. 

[1] J. Lindinger, A. Buchleitner, A. Rodríguez, Phys. Rev. Lett. 122, 106603 (2019)

[2] L. Pausch, E.G. Carnio, A. Rodríguez, A. Buchleitner, Phys. Rev. Lett. 126, 150601 (2021)

[3] L. Pausch, E.G. Carnio, A. Buchleitner, A. Rodríguez, New J. Phys. 23, 123036 (2021)

[4] L. Pausch, A. Buchleitner, E.G. Carnio, A. Rodríguez, arxiv:2205.04209

Basi(c)s of Nonequilibrium Statistical Mechanics--Made Simple

Despite its widespread use in physics (and other disciplines), many basic concepts in statistical mechanics are vigorously debated among scholars. This can cause misunderstandings and problems, in particular when one tries to apply these concepts in fields such as quantum thermodynamics, open quantum systems theory or quantum many-body physics, where one is interested in dynamics far from equilibrium and far from the thermodynamic limit. In this talk, I will explain five widely used concepts---Landauer’s principle, entropy, entropy production, the second law and Clausius’ inequality---in a transparent pedagogical way and show how they all fit together without becoming redundant. I also sketch how to use these concepts for current problems in open quantum systems and many-body physics.

Zoom link: http://s.ic.fo/Seminar160222

Meeting ID: 859 1889 4720

Passcode: 267822 

A postdoc position is available at the University of Valencia in the field of quantum information and many-body physics, starting September 2022.

For more information, please see the link:

https://quantiki.org/position/postdoc-position-valencias-university-spain