Measurement-induced quantum phases realized in a trapped-ion quantum computer
No TL;DR found
Abstract
Many-body open quantum systems balance internal dynamics against decoherence\nfrom interactions with an environment. Here, we explore this balance via random\nquantum circuits implemented on a trapped ion quantum computer, where the\nsystem evolution is represented by unitary gates with interspersed projective\nmeasurements. As the measurement rate is varied, a purification phase\ntransition is predicted to emerge at a critical point akin to a fault-tolerent\nthreshold. We probe the "pure" phase, where the system is rapidly projected to\na deterministic state conditioned on the measurement outcomes, and the "mixed"\nor "coding" phase, where the initial state becomes partially encoded into a\nquantum error correcting codespace. We find convincing evidence of the two\nphases and show numerically that, with modest system scaling, critical\nproperties of the transition clearly emerge.\n