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Measurement-induced quantum phases realized in a trapped-ion quantum computer
Published
Author(s)
Michael Gullans, Alexey Gorshkov, David Huse, Christopher Monroe, Crystal Noel, Pradeep Niroula, Daiwei Zhu, Andrew Risinger, Laird Egan, Debopriyo Biswas, Marko Cetina
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.
Gullans, M.
, Gorshkov, A.
, Huse, D.
, Monroe, C.
, Noel, C.
, Niroula, P.
, Zhu, D.
, Risinger, A.
, Egan, L.
, Biswas, D.
and Cetina, M.
(2022),
Measurement-induced quantum phases realized in a trapped-ion quantum computer, Nature Physics, [online], https://doi.org/10.1038/s41567-022-01619-7, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932777
(Accessed October 2, 2025)