Current students

Jinglei Zhang, Aarhus University

When a quantum system is monitored with a sequence of measurements, its evolution is given by a stochastic quantum trajectory. At any time the state, and therefore any prediction we can make about an observable, is dependent on previous measurement outcomes. Past quantum state, on the other hand, is a general theory that allows us to include the information collected about the system with later measurements.

Luca Dellantonio, University of Copenhagen, Denmark

The fields of opto- and electromechanics have facilitated numerous advances in the areas of precision measurement and sensing, ultimately driving the studies of mechanical systems into the quantum regime. To date, however, the quantization of the mechanical motion and the associated quantum jumps between phonon states remains elusive. For optomechanical systems, the coupling to the environment was shown to preclude the detection of the mechanical mode occupation, unless strong single photon optomechanical coupling is achieved.

M.Sc. Thesis Presentation

Candidate: Stefanie Beale
Supervisor: Raymond Laflamme

PhD Thesis Presentation

Candidate: Chunhao Wang

Konrad Banaszek - Centre of New Technologies, University of Warsaw

Quantum physics holds the promise of enhanced performance in metrology and sensing by exploiting non-classical phenomena such as multiparticle interference. Specific designs for quantum-enhanced schemes need to take into account noise and imperfections present in real-life implementations.

Dmitri Iouchtchenko

It has been suggested that placing dipolar linear rotors in one-dimensional lattices at zero temperature results in a model that has a transition between ordered and disordered phases. We use the density matrix renormalization group (DMRG) to compute ground states of this model near the critical point to provide further evidence of the phase transition. In particular, we numerically demonstrate divergences in both the entanglement entropy and the correlation length.

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A half-day open house showcasing the latest developments in topological quantum materials, superconducting quantum circuits, quantum sources and detectors.

This two-day workshop is an opportunity for the people working in the field to discuss and compare different approaches, our ability to reduce assumptions and together attempt to define a coherent view on security proofs, claims and assumptions in practical QKD.

Brad Lackey, University of Maryland

A nonlocal game with a synchronous correlation is the ideal protocol for quantum key distribution. In this work we examine analogues of Bell's inequalities for synchronous correlations. We show that unlike in the nonsynchronous case (e.g. with the CHSH inequality) there can be no quantum Bell violation among synchronous correlations with two measurement settings. However we exhibit explicit analogues of Bell's inequalities for synchronous correlation with three measurement settings and two outputs that do admit quantum violations.