February 3, 2023

A protocol to explore entanglement dynamics via spacetime duality

A protocol to explore entanglement dynamics via spacetime duality Spacetime duality: exchanging the roles of space and time in quantum dynamics simulates the effect of monitoring by an outside observer. Credit: Ippoliti and Khemani.

Researchers at Stanford University have recently carried out a study exploring the role of quantum measurements in many-body dynamics.

They specifically presented a protocol that can be used to realize dynamics that include quantum measurements in quantum computers and quantum simulators, while avoiding a procedural step known as postselection.

In order to measure entanglement in non-unitary dynamics, researchers would have to repeat an experiment many times in order to satisfy the famous postselection requirement, which would be prohibitively hard. The primary objective of this study was to devise a strategy to enable the experimental realization of these dynamics without the need for postselection. The team proposed that this could be achieved by exchanging the roles of space and time, leveraging an idea known as spacetime duality.

The virtual evolution of the system examined by the researchers turned out to be non-unitary, which essentially means that it includes some measurement elements. These elements, however, are fully deterministic and can be reliably and repeatedly reproduced. This crucial characteristic allowed them to translate their idea into a protocol to realize and study entanglement dynamics in quantum simulators. (Phys.org)

The paper has been published in Physical Review Letters.

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