RQS

The summer school brings together young researchers to learn various timely topics in Quantum science and work on hands-on problem sets together.

More details can be found at: https://qsimconference.org/summer-school/

Gauge theory is a powerful theoretical framework for understanding the fundamental forces in the standard model. Simulating the real time dynamics of gauge theory, especially in the strong coupling regime, is a challenging classical problem. Quantum computers offer a solution to this problem by taking advantage of the intrinsic quantum nature of the systems. The Schwinger model, that is the 1+1 dimensional U(1) gauge theory coupled to fermions, has served as a testbed for different methods of quantum simulation.

https://qsimconference.org/summer-school/

Quantum spin liquids are exotic phases of matter whose low-energy physics is described as the deconfined phase of an emergent gauge theory. With recent theory proposals and an experiment showing preliminary signs of Z2 topological order [G. Semeghini et al., Science 374, 1242 (2021)], Rydberg atom arrays have emerged as a promising platform to realize a quantum spin liquid. In this work, we propose a way to realize a U(1) quantum spin liquid in three spatial dimensions, described by the deconfined phase of U(1) gauge theory in a pyrochlore lattice Rydberg atom array.

In this letter, we propose the first algorithm to achieve the Heisenberg limit for learning an interacting N-qubit local Hamiltonian. After a total evolution time of O(ε−1), the proposed algorithm can efficiently estimate any parameter in the N-qubit Hamiltonian to ε error with high probability. Our algorithm uses ideas from quantum simulation to decouple the unknown N-qubit Hamiltonian H into noninteracting patches and learns H using a quantum-enhanced divide-and-conquer approach.

One promising application of near-term quantum devices is to prepare trial wavefunctions using short circuits for solving different problems via variational algorithms. For this purpose, we introduce a new circuit design that combines graph-based diagonalization circuits with arbitrary single-qubit rotation gates to get Hamiltonian-based graph states ansätze (H-GSA). We test the accuracy of the proposed ansatz in estimating ground state energies of various molecules of size up to 12-qubits.

Find more information and register at https://quantum.princeton.edu/​RQS2024

In this Career Connections talk, hosted at Princeton University and online, Michael Foss-Feig will give a talk on the following:

As a graduate student researching quantum machine learning at the Institute for Quantum Computing, Joan wanted to better understand the ethical implications of her work. Drawing from conversations on AI ethics and taking a critical perspective on many of the promises being made in the quantum computing space, Joan founded the Quantum Ethics Project to build community around ensuring quantum technology benefits everyone and harms no one. 

The RQS Annual Institute Workshop brings together researchers from all five RQS universities - University of Maryland (UMD), Duke, Princeton, Yale, and North Caroline State University (NCSU), to discuss accomplishments and research findings from the previous year, and collaborate and plan for next year(s).