Future graduate students

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.

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

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.

Apply for QCSYS and discover how the physics and mathematics of quantum mechanics and cryptography merge into one of the most exciting topics in contemporary science – quantum cryptography.

• Engage in hands-on experiments and attend lectures
• Collaborate with renowned researchers
• Participate in group work and social activities
• Stay in a university residence with QCSYS counsellor

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.

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.

Erik Woodhead, The Institute of Photonic Sciences, Spain

Quantum key distribution (QKD) can be implemented in both so-called
entanglement-based (EB) and prepare-and-measure (PM) configurations. There is a certain degree of equivalence between EB and PM schemes from the point of view of security analysis that has been heavily exploited in the literature over the last fifteen years or so, where a given PM protocol is reduced to an equivalent EB protocol (following the BBM92 argument) whose security is then proved.

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.

Mario Berta, California Institute of Technology

The quantum capacity of a memoryless channel is often used as a single figure of merit to characterize its ability to transmit quantum information coherently. The capacity determines the maximal rate at which we can code reliably over asymptotically many uses of the channel. We argue that this asymptotic treatment is insufficient to the point of being irrelevant in the quantum setting where decoherence severely limits our ability to manipulate large quantum systems in the encoder and decoder.