A framework using purely imaginary Hamiltonians and specific coupling operators in linear quantum systems enables back-action-evading measurements and quantum non-demolition variables, with coherent feedback for non-compliant cases.
Yamamoto, Decoherence-free linear quantum subsystems , IEEE Transactions on Automatic Control 59 (2014), no
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On Realization of Back-Action-Evading Measurements and Quantum Non-Demolition Variables via Linear Systems Engineering
A framework using purely imaginary Hamiltonians and specific coupling operators in linear quantum systems enables back-action-evading measurements and quantum non-demolition variables, with coherent feedback for non-compliant cases.