The exceptional optical and spin properties of the negatively charged nitrogen-vacancy (NV) center in diamond have led to a wide range of hallmark demonstrations ranging from super-resolution imaging to quantum entanglement, teleportation, and sensing. The solid-state environment of the NV allows us to engineer nano-structures that can enhance the properties of the NV and improve the readout and initialization fidelities of the spin.
Poompong Chaiwongkhot of the Department of Physics and Astronomy will be defending his thesis:
Detection Efficiency Mismatch and Finite-Key-Size Attacks on Practical Quantum Cryptography Systems
Poompong is supervised by Research Assistant Professor Vadim Makarov.
In this talk, I will discuss correlations that can be generated by performing local measurements on bipartite quantum systems. I'll present an algebraic characterization of the set of quantum correlations which allows us to identify an easy-to-compute lower bound on the smallest Hilbert space dimension needed to generate a quantum correlation. I will then discuss some examples showing the tightness of our lower bound.
The classical max-flow min-cut theorem describes transport through certain idealized classical networks. We consider the quantum analog for tensor networks. By associating a tensor to each node in an integral flow network, we can also interpret it as a tensor network, and more specifically, as a linear map.
Sean Walker of the Department of Chemistry will be defending his thesis:
Molecular nanomagnets for novel spintronics devices
Sean is supervised by Professor Jonathan Baugh.
Join us for two days at the Institute for Quantum Computing (IQC) for the Teaching Quantum Technology workshop (TQT) December 5-6. You will have the opportunity to attend lectures and engage in hands-on activities focused on the integration of quantum technology into the current teaching curriculum. We will discuss quantum information science and technology to give you a deeper understanding of quantum mechanics.
We will review known results about order isomorphisms of C*-algebras,
and will describe some applications to complete positivity of maps and
a generalization of the Choi matrix. (This is joint work with Vern Paulsen.)
Then we will describe some applications to quantum information theory.
We study the word problem for the free skew field of non-commutative rational functions. We prove that an existing algorithm due to Gurvits is actually a deterministic polynomial time algorithm for this problem (over the rationals). Our analysis is simple, providing explicit bounds on the "capacity'' measure of totally positive operators introduced by Gurvits.
Juan Miguel Arrazola of the Department of Physics and Astronomy will be defending his thesis:
Practical Quantum Communication
Juan Miguel is supervised by Professor Norbert Lütkenhaus.
David Luong of the Department of Physics and Astronomy will be defending his thesis:
The Practical Realization of Quantum Repeaters: An Exploration
David is supervised by Professor Norbert Lütkenhaus.
The Quantum Innovators workshop brings together the most promising young researchers in quantum physics and engineering. Guests are invited for a four-day workshop aimed at exploring the frontier of our field.
The Institute for Quantum Computing (IQC) will open its doors to all members of the community as part of Reunion at the University of Waterloo. Bring the whole family to discover the excitement of quantum mechanics and learn about the world-class research that is happening right here in our community!
Anirudh of the Department of Physics and Astronomy will be defending his thesis:
Experimentally Testable Noncontextuality Inequalities via Fourier-Motzkin Elimination.
Jihyun is supervised by Professors Joseph Emerson and Robert Spekkens.
In recent years, Bayesian methods have been proposed as a solution to a wide range of issues in quantum state and process tomography. In this talk, we make these methods practical by solving three distinct problems: numerical intractability, a lack of informative prior distributions, and an inability to track time-dependent processes. Our approach allows for practical computation of point and region estimators for quantum states and channels, and allows tracking of time-dependent states.
Jihyun Park of the Department of Physics and Astronomy will be defending his thesis:
Emulation of Anyonic Statistics using High-Fidelity NMR Quantum Information Processing (QIP) Techniques.
Jihyun is supervised by Professor Raymond Laflamme.
Quantum-optical frequency conversion (QFC) provides a method, usually via a nonlinear interaction with an optical ‘pump’ beam, to keep the quantum features of an optical ‘signal’ intact. Most QFC experiments
upconvert near-infrared signal photons to those in the visible or near-visible regime due to the availability of highly-efficient detectors that can be operated at high speeds without incurring a severe noise penalty.
We introduce an approach to homomorphic encryption on quantum data.
Homomorphic encryption is a cryptographic scheme that allows
evaluations to be performed on ciphertext without giving the evaluator
access to the secret encryption key. Random operations from an finite
abelian unitary group chosen using an encryption key chosen
uniformly at random perform the encryption, and operations that lie
within the centralizer of the encryption group perform the
