Faculty

Chernoff Bound for Quantum Operations is Faithful

Nengkun Yu, Tsinghua University & University of Technology, Sydney

We consider the problem of testing two quantum hypotheses of quantum operations in the setting of many uses where an arbitrary prior distribution is given. The concept of the Chernoff bound for quantum operations is investigated to track the minimal average probability of error of discriminating two quantum operations asymptotically.

Joachim Nsofini of the Department of Physics and Astronomy is defending his thesis:

Quantum Information Enabled Neutron Interferometry

Joachim is supervised by IQC faculty member David Cory.

Mode-selection, purification, and ultrafast manipulation of quantum light with nonlinear waveguide devices

John Donohue, University of Paderborn

The temporal structure of quantum light offers an intrinsically high-dimensional and robust platform for encoding quantum information. In particular, the time-frequency degree of freedom can be explored in the frame of pulsed temporal modes, the ultrafast analogy to spatial Hermite-Gauss or orbital angular momentum modes. These overlapping temporal modes are naturally compatible with waveguide devices and fibre infrastructure, but present unique challenges to fully explore and exploit.

A platform to study many-body physics with photons

Hakan Tureci, Princeton University

The past decade has seen enormous experimental progress in building superconducting electrical circuits featuring artificial atoms subject to the quantized electromagnetic field of microwave photons. The fabrication and control of superconducting circuits has reached a stage where many such elements can be wired up into intricate networks, allowing the preparation and readout of complex quantum states of photons and atoms.

Join us at the Institute for Quantum Computing for a two-week introduction to the theoretical and experimental study of quantum information processing.

During the Undergraduate School on Experimental Quantum Information Processing (USEQIP) will be exposed to lectures and experiments on the following topics and more.

• Quantum information processing
• Implementation for quantum information processing
• Experimental exploration

Discover how mathematics, physics, computer science, engineering, and more combine into one of the most exciting topics in modern science – quantum information – at the Quantum Cryptography School for Young Students (QCSYS). QCSYS is a unique enrichment program for high school students that will run this August.

QCSYS will be a free, online program that offers a blend of expert lectures, small group discussions, problem solving, and opportunities for mentoring and networking with world-leading quantum researchers.

You will:

The optimality of projections for quantum state exclusion

Abel Molina, IQC

We will first motivate the problem of quantum state exclusion of pure states, through its connections with the PBR game and with compatibility conditions for quantum state assignments. Then, we will discuss our recent result regarding the optimality of projections for perfect state exclusion of 3 pure states in 3 dimensions (arXiv:1702.06449).