Events

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.

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.

Juan Xu - Nanjing University of Aeronautics and Astronautics

Quantum secret sharing (QSS) mainly deals with the splitting and distributing of an arbitrary secret among n sharers using quantum resources. While quantum secret sharing schemes often use shared entangled states, it is also possible to define a notion of quantum secret sharing without the use of entangled states.

Surface Acoustic Waves in Quantum Systems

Mats Powlowski

​Surface acoustic waves (SAWs) are acoustic phonons that travel along the surface of a material and have been used for a wide variety of purposes, from RF filters to acoustic cavities to biosensors.

Brad Lackey, University of Maryland

A nonlocal game with a synchronous correlation is the ideal protocol for quantum key distribution. In this work we examine analogues of Bell's inequalities for synchronous correlations. We show that unlike in the nonsynchronous case (e.g. with the CHSH inequality) there can be no quantum Bell violation among synchronous correlations with two measurement settings. However we exhibit explicit analogues of Bell's inequalities for synchronous correlation with three measurement settings and two outputs that do admit quantum violations.