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Geometry of phase-covariant qubit channels

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arxiv 2210.17448 v2 pith:NEQHTUKK submitted 2022-10-31 quant-ph math-phmath.MP

classification quant-phmath-phmath.MP
keywords phase-covariantchannelsgeometryqubitanalyticallyanalyzebreakingchannel
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We analyze the geometry on the space of non-unital phase-covariant qubit maps. Using the corresponding Choi-Jamio{\l}kowski states, we derive the Hilbert-Schmidt line and volume elements using the channel eigenvalues together with the parameter that characterizes non-unitality. We find the shapes and analytically compute the volumes of phase-covariant channels, in particular entanglement breaking and obtainable with time-local generators.

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  1. Open-systems tools for non-thermalizing closed quantum systems

    quant-ph 2025-04 conditional novelty 6.0 of 10

    State-dependent, excitation-conserving quantum circuits with adaptively chosen gate arrangements maintain inhomogeneous non-thermalizing qubit dynamics that open-systems tools can distinguish from random thermalizing ...

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