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Monday, July 9, 2018 2:30 pm - 2:30 pm EDT (GMT -04:00)

Quantum metrology gets real

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.

Tuesday, July 17, 2018 2:00 pm - 2:00 pm EDT (GMT -04:00)

Ground states of linear rotor chains via the density matrix renormalization group

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.

Thursday, August 2, 2018 2:00 pm - 2:00 pm EDT (GMT -04:00)

Quantum nondemolition measurement of mechanical motion quanta

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.

Friday, August 3, 2018 2:00 pm - 2:00 pm EDT (GMT -04:00)

Past quantum state for continuous variable systems

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.

Thursday, August 9, 2018 12:00 pm - 12:00 pm EDT (GMT -04:00)

Spatial Isolation Implies Unconditional Zero Knowledge, Even With Entanglement

Nick Spooner, University of Southern California, Berkeley

Understanding the computational power of multi-prover interactive proofs where the provers may share entanglement -- the complexity class MIP* -- is a central question in quantum computation. In 2012, Ito and Vidick showed that this model is at least as powerful as MIP, i.e. NEXP is contained in MIP*.

Thursday, August 9, 2018 1:00 pm - 1:00 pm EDT (GMT -04:00)

Quantum computing at Alibaba Group

Yaoyun Shi, Director, Alibaba Quantum Laboratory (AQL)

I will take this opportunity to share with the Waterloo quantum community the thinkings behind Alibaba Group's quantum computing program and our main activities. Questions and comments from the audience are welcome.

About the speaker: Yaoyun Shi is a computer scientist trained at Beijing University, Princeton, and Caltech. He taught at University of Michigan before moving to Alibaba to launch its quantum computing program.