Methods and arrangements for coupling a quantum mechanical system to a quantum mechanical environment

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A method for coupling a quantum mechanical system to a quantum mechanical environment, wherein the quantum mechanical system is capable of exhibiting transitions between a plurality of eigenstates, and the quantum mechanical system comprises a unimon qubit circuit comprising a coplanar waveguide, wherein the coplanar waveguide is intercepted by at least one Josephson junction and has a length between its two ends, wherein the unimon qubit circuit is configured with a plurality of modes, the method comprising:

• providing at least one coupling location for coupling the quantum mechanical system to the quantum mechanical environment, wherein the quantum mechanical environment is capable of exhibiting modes from a continuous spectrum, and wherein said coupling is characterized with a set of parameters of the quantum mechanical system;
• and
• coupling the quantum mechanical system to the quantum mechanical environment through the at least one coupling location, wherein a selected combination of the at least one coupling location and the set of parameters intentionally causes to suppress at least one of said transitions when intentionally changing a state of the quantum mechanical system by the quantum mechanical environment.