Observing a purification phase transition with a trapped ion quantum computer
ORAL · Invited
Abstract
Many-body open quantum systems balance internal dynamics against decoherence from interactions with an environment. Here, we explore this balance via random quantum circuits implemented on a trapped-ion quantum computer, where the system evolution is represented by unitary gates with interspersed projective measurements. As the measurement rate is varied, a purification phase transition is predicted to emerge at a critical point akin to a fault-tolerent threshold. We probe the "pure'' phase, where the system is rapidly projected to a deterministic state conditioned on the measurement outcomes, and the "mixed'' or "coding'' phase, where the initial state becomes partially encoded into a quantum error correcting codespace. We find evidence of the two phases and show numerically that, with modest system scaling, critical properties of the transition emerge.
**This work is supported by the ARO through the IARPA LogiQ program, the NSF STAQ Program, the AFOSR MURIs on Dissipation Engineering in Open Quantum Systems and Quantum Measurement/Verification and Quantum Interactive Protocols, the ARO MURI on Modular Quantum Circuits, the DoE Quantum Systems Accelerator , the DoE ASCR Accelerated Research in Quantum Computing program (award No. DE-SC0020312).
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Publication: arXiv:2106.05881
Presenters
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Crystal Noel
- Duke
- Department of Electrical and Computer Engineering, Duke Quantum Center, Duke University; Joint Quantum Institute, Department of Physics, University of Maryland, College Park.
- Joint Quantum Institute, University of Maryland, College Park; Duke University Department of Electrical and Computer Engineering, Duke Quantum Center
- JQI/QuICS/UMD Physics, DQC/Duke ECE
- JQI and QuICS and Department of Physics, University of Maryland, College Park; Duke Quantum Center and Department of ECE, Duke University