Error Mitigation Thresholds in Noisy Quantum Circuits
Abstract: Noise in quantum devices can be corrected with quantum error correction or it can be mitigated via classical post-processing. The latter can be done with negligible overhead in the space-time volume of the quantum circuit, but will generally incur exponential overhead in sampling complexity. We use statistical-mechanical arguments to discuss the limits of error mitigation in quantum circuits. We show that noisy random quantum circuit models with imperfectly characterized noise remain robust to imperfections at a finite rate of disorder, before exhibiting a diso
Quantum technology for the real world
Abstract: Quantum sensors will broadly impact industries including transportation and logistics,telecommunications, aerospace, defense, and geophysical exploration. They offer transformativeperformance gains over conventional technologies; atomic clocks are precise to 1 second in 50 billionyears. However, these laboratory devices are large, fragile, and expensive. Commercial quantum
Quantum Simulation for Nuclear Effective Field Theories
Quantum computers offer the potential to perform simulations of nuclear processes that are infeasible for classical devices. With a goal of understanding the necessary quantum resources to realize such potential, we estimate the qubit costs and gate costs to simulate an effective nuclear field theory on a cubic lattice, evaluating the various trade-offs in choice of the form of the effective field theory and how this choice interacts with the qubit requirements of encoding the fermionic degrees of freedom into qubits and the gate counts needed for state-of-the-art Hamiltonian simulation.
RQS Workshop: Grant Writing 1/2 (Education Grants)
Abstract:
How to write successful grant proposals, pushing your writing skills to the next level. Erin will provide a general overview of grant writing and focus on proposals for education and outreach, a key mandate of the NSF grant for the Quantum Leap Challenge Institute for Robust Quantum Simulation.
Please prepare your questions in advance and send them to rqs-seed@umiacs.umd.edu.
RQS Workshop: Grant Writing 2/2 (Research Grants)
Abstract:
How to write successful grant proposals, pushing your writing skills to the next level. Mohammad will provide a general overview of grant writing and focus on proposals for research, a key mandate of the NSF grant for the Quantum Leap Challenge Institute for Robust Quantum Simulation.
Please prepare your questions in advance and send them to rqs-seed@umiacs.umd.edu.
Location: PSC 3150https://umd.zoom.us/j/5942646305
Exploring one-dimensional Z2 lattice gauge theories
Abstract: Although lattice gauge theories are primarily considered in particle physics, they are also a valuable platform to study strongly correlated quantum systems in condensed-matter physics. Particularly interesting is the study of confinement, which can arise when dynamical charges are coupled to gauge fields. In this talk, I will present our recent work on a one-dimensional Z2 lattice gauge theory (LGT), where dynamical matter is coupled to Z2 gauge field [1].
Subtleties in chiral anomalies and time crystals – a progress report
Abstract: I will discuss two topics that I have been collaborating on in CMTC. The first involves a careful study of an analog of the chiral anomaly in one dimension that was motivated by work from the Galitski group at Maryland which showed that the response of the chiral charge to electromagnetic fields could be affected by interactions. At the same time, the chiral anomaly, when it arises at boundaries of topological phases, is known to be associated with topological terms that cannot be renormalized.
A quantum prediction as a collection of knowledge-restricted classical predictions
Abstract: How are the phenomena of quantum theory novel when compared to those of a classical theory? Spekkens has introduced a classical model that reproduces a host of phenomena that appear in quantum mechanics such as noncommutation, interference, and teleportation. The model is constructed as a classical theory where agents have restricted knowledge about the underlying states. While the model captures many aspects of quantum theory, it cannot capture all. Here we show how it requires only a single augmentation to give quantum theory for certain systems.
Phase diagram of the XXZ spin-1/2 model on the pyrochlore lattice and its relation to the Programmable Rydberg Atoms Simulator
Abstract: The spin-1/2 nearest-neighbor XXZ model on the pyrochlore lattice is an iconic frustrated three-dimensional spin system with a rich phase diagram on the $\lambda$ axis, where $\lambda$ is the XXZ interaction anisotropy.
New species of butterflies reported in topological crystalline states
Abstract: The study of topological phases of matter and the invariants that define them has become a central pursuit of condensed matter physics. In particular, crystalline systems are known to host a large set of topological invariants, but the physical response properties associated to them are still not fully understood. In this talk we describe how to construct a topological response theory that makes detailed predictions about a set of crystalline topological invariants; we focus on two of them, the 'discrete shift', and a quantized charge polarization.