Quantum dynamics of many-qubit systems in dissipative nanocavities

IQSE AMO QO Seminar Series

Pizza will be served for IQSE members at 11:00 am. The talk will start around 11:30 am.

Speaker: Dr. Alexey Belyanin

Venue: IQSE SEMINAR ROOM (MPHY 578)

ABOUT THE SPEAKER: Alexey Belyanin has conducted theoretical research in high-energy astrophysics, quantum optics, and physics of semiconductors. His current research interests include nonlinear, ultrafast, and quantum optics of semiconductor nanostructures, two-dimensional materials, topological insulators and metals, and physics of the optoelectronic devices. For updated information, current research projects, and publications, see http://people.tamu.edu/~belyanin/.

EVENT DETAILS: Solid-state nanocavity QED attracted much interest as a promising platform for quantum information and quantum sensing systems. A typical scenario involves an ensemble of quantum dots, defects in crystals, atoms, or molecules, strongly coupled to a quantized electromagnetic field in a dielectric or plasmonic nanocavity. While the treatment of open quantum systems with many degrees of freedom is usually heavily numerical, here we develop a version of the stochastic Schroedinger-Langevin formalism which allows one to develop analytic insight into nonperturbative nonlinear dynamics in many cases of practical interest. We illustrate it with two examples. In the first example, the strong coupling regime is realized at the nonlinear resonance between electron, photon, and vibrational degrees of freedom. When the strength of such a parametric three-wave interaction is higher than the dissipation rates, entangled electron-photon-phonon states of GHZ type are formed and the emission spectra acquire a characteristic multi-peak structure. This scenario can describe diverse quantum systems including molecules, semiconductor quantum dots, and cavity optomechanics systems. We show how these very different physical models of electron-photon-vibrational coupling can be mapped onto the universal parametric Hamiltonian. In the second example, we study quantum dynamics of many emitters strongly coupled to a spatially nonuniform field of a plasmonic nanocavity and taking into account the spread of their transition frequencies, dissipation, and decoherence for all degrees of freedom. We show how dissipation drives the system into robust many-qubit entangled dark states that are decoupled from the cavity field. The ability to generate and control such states is an important problem for plasmonic nanocavities where the dissipation of a cavity mode is much faster than the relaxation in quantum emitters.

ZOOM information:

https://tamu.zoom.us/j/98156251523?pwd=QVdSdGxtL1UyY0g1L083SU5QR0QrUT09

Meeting ID: 981 5625 1523
Passcode: 297578

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