A Lagrange-Sylvester interpolation scheme decomposes arbitrary non-unitary operators into a linear combination of at most 2N unitaries with no truncation error, enabling cheaper simulation of open quantum systems.
Akamatsu, Quarkonium in quark–gluon plasma: Open quantum system approaches re-examined, Progress in Particle and Nuclear Physics 123, 103932 (2022)
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Unitary Dilation Strategy Towards Efficient and Exact Simulation of Non-Unitary Quantum Evolutions
A Lagrange-Sylvester interpolation scheme decomposes arbitrary non-unitary operators into a linear combination of at most 2N unitaries with no truncation error, enabling cheaper simulation of open quantum systems.