Applied Physics Seminar - Ruben Verresen - Harvard

Event time: 
Monday, February 27, 2023 - 1:00pm to 2:00pm
YQI Researchers
YQI Seminar Room See map
Event description: 

Long-range Entanglement and Topological Order in Quantum Devices: from Hamilton(ians) to Galois

One of the most remarkable discoveries in quantum physics is that long-range entangled qubits can give rise to emergent gauge fields and collective excitations with generalized exchange statistics. Despite the importance of such ‘topological’ states for quantum information processing, they are extremely challenging to find in materials. In this talk, we explore how novel ‘bottom-up’ quantum devices—built atom by atom, qubit by qubit—challenge this status quo. For instance, topological states can emerge as the low-energy description of a many-body Hamiltonian, with experimental data on Rydberg atom tweezer arrays. Alternatively, such long-range entanglement can be obtained from shallow circuits with measurements and feedforward, with experimental data on cold ions. The latter route can be interpreted as many-body quantum teleportation and is the only way to avoid fundamental constraints imposed by locality and unitarity, leading to a surprising connection to the unsolvability of the quintic.