Events

Dagmar Bruss, University of Duesseldorf

The resource theory of quantum coherence studies the off-diagonal elements of a density matrix in a distinguished basis, whereas the resource theory of purity studies all deviations from the maximally mixed state. We establish a direct connection between the two resource theories, by identifying purity as the maximal coherence, which is achievable by unitary operations. The states that saturate this maximum identify a universal family of maximally coherent mixed states.

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

Alexander Grimm, Yale University

In recent years, circuit quantum electrodynamics (QED) has seen considerable efforts towards protecting quantum information from unwanted sources of decoherence through quantum error correction. Independent of the implementation, this is based on encoding a logical qubit into a stable manifold within a larger Hilbert space, whose symmetries restrict the number of independent errors and make them detectable and correctable.

MSc. Thesis Presentation

Candidate: Theerapat Tansuwannont

​Supervisor: Debbie Leung

David P. Pappas, National Institute of Standards and Technology (NIST)

A brief history and overview of the requirements to guide the research and development for high-coherence superconducting quantum circuits will be given. The main focus will be on materials development at NIST. Topics will include identifying and mitigating loss due to amorphous two-level systems at interfaces and how to scale the fabrication of small aluminum-oxide tunnel junctions. The junctions were studied with atom probe microscopy to get an understanding of where the oxidation occurs.

PhD Thesis Presentation

Candidate: Thomas McConkey

Supervisors, Matteo Mariantoni, Amir H. Majedi. On display in the Engineering graduate studies office, DWE 3520C. Oral defence Friday, June 1, 10:00 a.m., EIT 3142.

The number theory of quantum information

Jon Yard, IQC

Abstract: Quantum-mechanical amplitudes and unitaries are typically expressed over the complex numbers. Because there is a continuum of complex numbers, classical computations of quantum systems generally utilize finite-precision approximations by rational numbers.

PhD Thesis Presentation

Candidate: Dusan Sarenac

Supervisor: David Cory

On deposit in the Science graduate office, PHY 2013.
Oral defence Monday, June 4, 1:30 p.m., RAC 2009.

On Thursday, June 7 the Institute for Quantum Computing (IQC) and the Perimeter Institute for Theoretical Physics (PI) will participate in the one-day Many-body States and Dynamics Workshop.

The goal of the workshop is to  describe ongoing efforts to experimentally realize quantum many-body states and dynamics, and discuss interesting classes of states and dynamics that could be targeted.

Speaker: Tom Hunter and Neil Henderson

Abstract: A lot of different concepts and possibilities have been discussed. The final session will recap those and put them in perspective, with emphasis on the relevance to a "typical" university start up and the people involved.