PhD student
Department of Physics & Astronomy and Institute for Quantum Computing
Faculty member Norbert Lütkenhaus has been named a Fellow of the American Physical Society. He is recognized for his “pioneering theoretical contributions to the fields of quantum secure communications and optical quantum information processing.”
The Institute for Quantum Computing is pleased to announce a call for entries to the Quantum Shorts flash fiction competition. The competition is open to stories up to 1000 words long that take inspiration from quantum physics and include the phrase “There are only two possibilities: yes or no”. The competition is free to enter, offering prizes of up to US $1500.
Article by ICFO - The Institute of Photonic Sciences
An international team of scientists presents a thorough review in Nature on quantum machine learning, its current status and future prospects.
I will report on dynamical magnetic susceptibility measurements of
both bulk and thin film samples of the spin glass Copper Manganese.
By studying the Thermoremanent Magnetization (TRM) of multi-layer thin
films of various thicknesses, we are able to show the maximum energy
barrier encountered during correlated spin flip transitions is cut off
by the thickness of the film and is independent of temperature. The
distribution of energy barriers is shown to follow from a hierarchical
Hear Raymond Laflamme, founding director of the Institute for Quantum Computing and John von Neumann Chair in Quantum Information and Edwin Outwater, Music Director Laureate of the Kitchener-Waterloo Symphony, as they have a conversation about the making of Does God Play Dice (Quantum Etude).
Radio host Mike Farwell will moderate this conversation about their collaboration that integrated quantum physics and music to create a surprisingly random performance piece. You’ll even have the to watch highlights of the April 20 performance.
I will present a realization of a great photon pair source based on parametric down-conversion, and discuss a not-so-great limit to the performance of photon pair sources in general. The former is a fully fiber-coupled waveguide pair source with 46% raw heralding efficiency, and no optical alignment required. The latter restricts the achievable heralding efficiency, when spectrally filtering the photons to increase the purity.
Recent rapid advancements in nanofabrication technologies have widened the realm of possibilities in nanophotonics, nonlinear and sub-wavelength optics. Realizing nonlinear optics in subwavelength scale paves the way for low cost integrated photonics. Ultra-high-Q photonic crystal nanocavities and nanostructured materials are examples of such structures. Those structures offer very small mode volume guaranteeing highly enhanced field intensity.
An approach to quantum random number generation based on unambiguous quantum state discrimination (USD) is developed. We consider a prepare-and-measure protocol, where two non-orthogonal quantum states can be prepared, and a measurement device aims at unambiguously discriminating between them.
Motivated by their necessity for most fault-tolerant quantum computation schemes, we formulate a resource theory for magic states. We first show that robustness of magic is a well-behaved magic monotone that operationally quantifies the classical simulation overhead for a Gottesman-Knill type scheme using ancillary magic states. Our framework subsequently finds immediate application in the task of synthesizing non-Clifford gates using magic states.