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Space-Based Quantum Networking at JPL
IQC Special Seminar Featuring Makan Mohageg, NASA's Jet Propulsion Laboratory
JPL has been at the forefront of space-based quantum technologies. Cold Atom Lab is the first orbital experiment exploring the dynamics of Bose-Einstein condensates in micro-gravity. Deep Space Atomic Clock demonstrated that a trapped-Hg+ clock in space provides timing precision and accuracy required for improved spacecraft autonomous navigation.
Error correction in quantum computers and beyond
IQC Special Seminar Aleksander Kubica, Amazon Web Services Center for Quantum Computing
Quantum computers introduce a radically new paradigm of information processing and revolutionize our thinking about the world. However, designing and building quantum computers that operate properly even when some of their components malfunction and cause errors is a heroic endeavor.
Reactive Conjugated Polymers for Selective Dispersion of Carbon Nanotubes
IQC Colloquium, Alex Adronov McMaster University
Single-Walled Carbon Nanotubes (SWNTs) exhibit a number of unique mechanical, thermal, and electronic properties that render them useful for numerous applications, ranging from molecular electronics to nano-scale construction materials. However, SWNTs are highly insoluble and are devoid of reactive functionality, posing major limitations to their modification, manipulation, and ...
IQC Student Seminar featuring Junan Lin
Characterizing states and measurements: principles and approaches
Towards a quantum Internet with single atoms in cavities
IQC Special Seminar - Olivier Morin, MAX PLANCK INSTITUTE OF QUANTUM OPTICS
Building a quantum internet requires to develop computing machines but also to connect them at various scales, e.g. via optical fibres. Although it is not yet known which physical platforms are suitable for this challenge, there is a consensus to say that light-matter interface will play an important role. ...
Multidimensional Quantum Walks
Math/CS Seminar Featuring Sebastian Zur (CWI, Amsterdam)
While quantum walk frameworks make it easy to design quantum algorithms, as evidenced by their wide application across domains,
the major drawback is that they can achieve at most a quadratic speedup over the best classical algorithm.
Quantum Matters Seminar Series: Strange metals from not-so-strange quasiparticles
Brad Ramshaw
Abstract: Strange metals have linear-in-temperature (T-linear) down to low temperature. Strange metals are found in many families of correlated electron materials, leading to the conjecture that a universal bound - the "Planckian" bound - limits the scattering rate of electrons to a value set by fundamental constants. If the Planckian bound exists, it would provide a natural explanation for why a host of seemingly disparate systems, including high-temperature superconductors and twisted bilayer graphene, all have T-linear resistivity. Perhaps more dramatically, T-linear resistivity suggests that electron-electron interactions are so strong that conventional concepts such as quasiparticles and Boltzmann transport do not apply in strange metals. I will present our work on the cuprate Nd-LSCO and the 5-layer superconducting nickelate that shows that conventional quasiparticle transport is alive and well, even in the strange metal regime where the Planckian bound is saturated. This suggests that we may not need to abandon the quasiparticle picture entirely, but that we need to better understand the source of scattering in these materials.
IQC Student Seminar Featuring Xi Dai
Landau-Zener tunneling: from weak to strong environment coupling
Abstract:
Landau-Zener tunneling, which describes the transitions in a two-level system during the passage through an anti-crossing, is a model applicable to a wide range of physical phenomena. Dissipation due to coupling between the system and the environment is an important factor in determining the transition rates. Using a superconducting tunable capacitively shunted flux qubit, we observe the crossover from weak to strong coupling to the environment. The weak coupling limit corresponds to small system-environment coupling and leads to environment-induced thermalization. In the strong coupling limit, environmental polarizations dress the system and transitions occur between the dressed states. Our results confirm previous theoretical studies of dissipative Landau-Zener tunneling in the weak and strong coupling limits, and motivate further work on understanding the intermediate regime. This work is relevant for understanding the role of open system effects in quantum annealing, where Landau-Zener transitions at small gaps, occurring in large scale systems, are important to understand for improving the success probability.
This talk is based on the preprint arXiv:2207.02017.
Collusion Resistant Copy-Protection for Watermarkable Functionalities
CS/Math Seminar - Jiahui Liu (UT Austin)
Copy-protection is the task of encoding a program into a quantum state to prevent illegal duplications. A line of recent works studied copy-protection schemes under ``1 -> 2 attacks'': the adversary receiving one program copy can not produce two valid copies. However, under most circumstances, vendors need to sell more than one copy of a program and still ensure that no duplicates can be generated. In this work, we initiate the study of collusion resistant copy-protection in the plain model. Our results are twofold: