Events

Tommaso Calarco, University of Ulm

Quantum technologies are based on the manipulation of individual degrees of freedom of quantum systems with exquisite precision. Achieving this in a real environment requires pushing to the limits the ability to control the dynamics of quantum systems of increasing complexity. Optimal control techniques are known to enable steering the dynamics of few-body systems in order to prepare a desired state or perform a desired unitary transformation.

Matthew McKague,  University of Otago, New Zealand

Is it possible to check a quantum computer's work? A quantum computation leaves behind no transcript, and for problems outside nondeterministic polynomial time (NP), it is not immediately clear whether we can verify that a quantum computation has been one correctly. Interactive proofs and self-testing offer a means of doing so.

Immanuel Bloch, Max Planck Institute of Quantum Optics

From Topological Bloch Bands to Long-Range Interacting Rydberg Gases - New Frontiers for Ultracold Atoms

Ultracold atoms in optical lattices have enabled to probe strongly interacting many-body phases in new parameter regimes and with powerful new observation techniques.

Dong Yang, University of Barcelona

From the viewpoint of resource theory, we establish the coherence
theory in an operational way. Namely we introduce the two basic concepts
— “coherence distillation” and “coherence cost” in the coherence
transformation processing and show that the evaluations of them are
reduced to single-letter formula: the coherence distillation is given by
the relative entropy of coherence (or in other words, we give the
relative entropy of coherence its operational interpretation) and the

Frank Wilhelm-Mauch, Universität des Saarlandes, Germany

Readout plays a central role in most quantum information protocols, notably in fault tolerance. While the readout of supercondcuting qubits operating in the microwave regime has reached exquisite performance using Josephson Parametric Amplifiers, these ask for large technological overhead that is difficult to scale down. We will show how a recently introduced microwave photon counter, the Josephson Photomultiplier JPM can be used for qubit readout with much less overhead and even elementary data processing on chip.

Fabian Furrer, Nippon Telegraph and Telephone (NTT) Corporation Basic Research Laboratories, Japan

We present a protocol for oblivious-transfer that can be implemented with an optical continuous-variable system, and prove its security in the noisy-storage model. This model assumes that the malicious party has only limited capabilities to store quantum information at one point during the protocol. The security is quantified by a trade-off relation between

Christoph Simon, University of Calgary

Quantum optical systems are well suited for pushing the boundaries of quantum physics. Two big goals in this context are the creation of entanglement over long distances and the observation of quantum effects on macroscopic scales. I will describe various theoretical and some experimental work in these directions.

Britton Plourde, University of Syracuse 

Low-loss resonators formed from lumped circuit elements or distributed transmission lines can be coupled to superconducting qubits. This is the basis for the numerous investigations of circuit-QED over the past decade. In this case, one is primarily interested in the coupling between the qubit and one or a few modes.

 John Martinis, University of California,
Santa Barbara

As microelectronics technology nears the end of exponential growth over time, known as Moore’s law, there is a renewed interest in new computing paradigms. I will discuss recent research at UCSB on superconducting quantum bits, as well as our recent start at Google to build a useful quantum computer to solve machine learning problems.  A recent experiment will be highlighted that extends the lifetime of a qubit state using quantum error correction.

Marco Piani, University of Strathclyde, Glascow

Quantum correlations exhibit a variety of non-classical features, which include quantum entanglement, quantum steering, and quantum discord. Such richness and diversity of quantum features calls for meaningful and quantitative approaches to their study. In this talk I will illustrate how it is possible to exploit techniques and insight from convex optimization, especially from semidefinite programming, to provide an operational quantification and interpretation of all the above aspects of the quantumness of correlations.