Upcoming Events

• CQT Talk by Marcelo Santos, Campus Pampulha - UFMG — Tue 31 Jan, 4:00 PM

CQT Talk by Marcelo Santos, Campus Pampulha - UFMG
Date/Time: Tuesday, 31 Jan at 4:00 pm
Venue: CQT Seminar Room, S15-03-15

Title: The Computational Power of Quantum Trajectories

Abstract:
In a quantized version of the infinite monkey problem, we show how to use quantum jumps to implement full quantum computation in qubits subjected to decoherence. In particular we show that if qubits emit spontaneously and scatter light inelastically at the same rate, then an appropriate detection of the photons produced by these processes is enough to implement any quantum algorithm. We demonstrate this through a simple an efficient scheme to produce cluster states. Our method demonstrates the full quantum computational power of quantum trajectories and it presents good prospects for implementation in typical 1-D systems such as coupled cavities and waveguides, nanowires, and equivalent.

• CQT Talk by Daw-Wei Wang, National Tsing-Hua University — Mon 06 Feb, 4:00 PM

CQT Talk by Daw-Wei Wang, National Tsing-Hua University
Date/Time: Monday, 06 Feb at 4:00 pm
Venue: CQT Seminar Room, S15-03-15

Title: Long-lived super-molecules and their implication to many-body physics

Abstract: We demonstrate that, in the presence of a microwave field, the effective interaction between polar molecules can be tuned to be attractive and so shallow that none or only a few bound states (super-molecules) can exist in the dilute limit. Binding energies, average sizes, and phase diagrams for both s-orbital (bosons) and p-orbital (fermions) dimers are systematically studied, together with bosonic trimer states. We explicitly show that the non-adiabatic transition rate can be easily tuned small for such ground state super-molecules, so that the system can be stable from collpase even near the associated potential resonance. Our results therefore suggest a feasible cold molecule system to investigate both novel few-body and many-body physics (for example, the p-wave BCS-BEC crossover for fermions and the paired condensate for bosons) that can not be easily accessed in single species atomic gases.

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