Seminar

Math/CS Seminar - Featuring Olivier Lalonde Université de Montréal

Quantum communication complexity, which concerns itself with determining how much communication is required by two participants having access to quantum resources to compute a boolean function of their inputs, has long been a lively subfield of quantum information science. The topic of this talk will be the power of shared prior entanglement relative to quantum communication without prior entanglement, which, despite having been studied for more twenty years, remains rather mysterious. After a quick review of the bare bones of classical communication complexity, I will proceed to discuss the model of entanglement-assisted communication complexity. 

Graphical CSS Code Transformation Using ZX Calculus

CS/Math seminar - Igor Klep, University of Ljubljana

The talk will discuss state polynomials, i.e., polynomials in noncommuting variables and formal states of their products. The motivation behind this theory arises from the study of correlations in quantum networks. We will give a state analog of Artin's solution to Hilbert's 17th problem showing that state polynomials, positive over all matrices and matricial states, are sums of squares with denominators.

13-level Qudit Measurement Demonstrated in Trapped Ions

IQC CS/Math seminar - Marc-Olivier Renou (INRIA, Paris-Saclay)

Quantum correlations are obtained when multiple parties perform independent measurements on a shared quantum state.  Bell’s seminal theorem proves that certain correlations predicted by quantum theory resist explanations in terms of any Local Hidden Variable theory based on shared randomness. But what about alternative explanations for quantum correlations, in terms of a hypothetical causal theory involving exotic bipartite resources generalising quantum bipartite entanglement in addition to shared randomness? 

Development of InSb Surface Quantum Wells for hybrid superconducting device applications. 

Abstract: Surface quantum well (QW) heterostructures in III-V semiconductors are compatible with proximitized superconductivity and offer a scalable planar platform for superconductor-semiconductor systems, such as those suggested for topological quantum computation and those suitable for topological phase transitions involving Majorana zero modes. Amongst III-V binary semiconductors, Indium Antimonide (InSb) has the smallest electron effective mass, highest spin orbit coupling and largest Land´e g-factor. Such material properties makes the pursuit of InSb QWs desirable for a number of quantum device applications, including quantum sensing, quantum metrology, and quantum computing.

Unfortunately, high quality two-dimensional electron gases (2DEGs) in InSb QWs have so far been difficult to realize. InSb QWs have generally relied on the use of modulation doping for 2DEG formation, but these structures have frequently reported issues with parasitic parallel conduction and unstable carrier densities. We report on the transport characteristics of field effect 2DEGs in surface InSb quantum wells which overcome these challenges and are suitable for future hybrid superconducting device applications.

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IQC Special Seminar, Xiaoqing Zhong, Senior Consultant Ernst & Young

Quantum communication has revolutionized the way we approach information processing and transmission. Building on the principles of quantum mechanics, quantum communication technologies offer capabilities that are impossible with classical communication.

AEQuO: A Comprehensive Measurement Allocation Protocol

IQC-QuICS MATH CS Seminar - Rolando Somma, Los Alamos National Laboratory

Fluctuation theorems provide powerful computational tools to study thermal equilibrium. Building upon these theorems, I will present a quantum algorithm to prepare the thermal state of a quantum system H1, at inverse temperature β≥0, from the thermal state of a quantum system H0.