Measurement-altered quantum criticality
Sara Murciano (Caltech University)
Seminar in the context of the OPENQMBP 2024 workshop at the Institut Pascal.
Quantum critical systems constitute appealing platforms for the exploration of novel measurement-induced phenomena due to their innate sensitivity to perturbations. I will discuss the impact of measurement on Ising chains using an explicit protocol, whereby uncorrelated ancillae are entangled with the critical chain and then projectively measured. I can identify different protocols wherein measurements (i) weakly modify the universal long-range entanglement and (ii) they completely obliterate it. I will also highlight a path to experimental realization in analog quantum simulators based on Rydberg atom arrays. Finally, I will describe how these ideas can establish a long-term quantum science application of ‘measurement-altered quantum criticality’.