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Probing measurement-induced effects in quantum walks via recurrence
Thomas Nitsche1, Sonja Barkhofen1, Regina Kruse1
1University of Paderborn, Applied Physics, Warburger Straße 100, 33098 Paderborn, Germany.
Science Advances
|July 3, 2018
Summary
Researchers simulated measurement-induced quantum dynamics using photonic quantum walks. They observed distinct recurrent and transient evolutions based on measurement timing, demonstrating control over quantum state changes.
Area of Science:
- Quantum physics
- Quantum information science
- Quantum optics
Background:
- Quantum measurements inherently alter a system's state due to non-unitary projection.
- Simulating measurement-induced effects requires controlled subspace measurements and continued evolution of the complementary subspace.
- Photonic quantum walks offer a versatile platform for quantum evolution but lack experimental realization of measurement-induced dynamics.
Purpose of the Study:
- To experimentally implement controlled measurements in a photonic quantum walk.
- To simulate and study measurement-induced single-particle quantum dynamics.
- To investigate the impact of measurement timing on quantum dynamics using recurrence as a metric.
Main Methods:
- Implemented controlled measurements in a discrete-time photonic quantum walk via time-multiplexing and deterministic outcoupling.
- Used coherent light to simulate one-particle conditional quantum dynamics.
- Studied recurrence, or return probability to the starting position, over 36 time steps.
Main Results:
- Successfully demonstrated measurement-induced dynamics in a photonic quantum walk platform.
- Observed differences in recurrence patterns between single-final-step measurements and measurements throughout the evolution.
- Showcased the emergence of recurrent and transient evolution signatures due to distinct measurement schemes.
Conclusions:
- Photonic quantum walks with controlled measurements can effectively simulate measurement-induced quantum dynamics.
- The timing of measurements significantly influences the observed quantum dynamics, leading to distinct recurrent and transient behaviors.
- This work provides a novel method for studying quantum measurement effects without requiring genuine quantum particles, using coherent light.
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