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QI: Fachverband Quanteninformation

QI 13: Quantum Simulation

QI 13.4: Vortrag

Dienstag, 7. März 2023, 11:45–12:00, F428

Accessing entanglement phase transitions from fluctuations — •Teemu Ojanen, Ali Moghaddam, and Kim Pöyhönen — Physics Unit, Faculty of engineering and natural sciences, Tampere University, Tampere Finland

Entanglement phase transitions in driven unitary quantum circuits subject to projective measurements provides an example of new type of critical phenomena in quantum information platforms. While the random unitary two-qubit gates drive the system rapidly into a volume-law entangled phase, the projective measurements of a finite fraction of qubits after each cycle try to freeze the proliferation of entanglement and drive the system to an area-law entangled phase. At critical measurement rate, the system undergoes a phase transition between the volume and area law phases. I will show how this phenomenon can be accessed directly via fluctuations of conserved quantities, circumventing the need to measure entanglement entropies. Remarkably, this could exponentially reduce the required number of measurements to observe entanglement phase transitions in experiments.