CQuIC Seminars
Many-body entanglement dynamics under adaptive quantum evolution
Presented by Aashish Clerk
Non-unitary quantum evolution as realized by adaptive quantum protocols (incorporating measurements and feedback operations) are a source of extremely rich dynamical phenomena, and a powerful tool in quantum information processing. In this talk, I’ll describe surprising many-body phenomena in settings where adaptive dynamics is realized using continuous measurements and feedforward. I will first discuss a novel entanglement phase transition that occurs in the unconditional state of a system of qubits subject to competing measurement + feedforward processes. As the transition occurs in the unconditional state, it can be detected without dealing with the postselection problem. Further, it is a rare example of an entanglement transition where it is possible to make analytic statements (here using tools from free probability theory). In the second part of the talk, I will focus on continuous measurement-feedback protocols that stabilize many-body entangled steady states. I will discuss the existence of a fundamental time-entanglement tradeoff in this kind of setups. These results also have direct relevance to reservoir engineering protocols, where engineering dissipation is used to stabilize remote entanglement.
3:30 pm, Thursday, March 28, 2024
PAIS-2540, PAIS
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