Combating the detrimental effects of noise remains a major challenge in realizing a scalable quantum computer. To help to address this challenge, we introduce a model realizing a controllablequbit-bath coupling using a sequence of LC resonators. The operating principle is similar to that of a recently proposed coplanar-waveguide cavity (CPW) system, for which our work introduces a complementary and convenient experimental realization. The lumped-element model utilized here provides an easily accessible theoretical description. We present analytical solutions for some experimentally feasible parameter regimes and study the control mechanism. Finally, we introduce a mapping between our model and the recent CPW system.
We introduce a setup which realises a tunable engineered environment for
experiments in circuit quantum electrodynamics. We illustrate this concept with
the specific example of a quantumbit, qubit, in a high-quality-factor cavity
which is separated from a resistor in another cavity by a capacitor. The
temperature of the resistor can be controlled in a well defined manner in order
to provide a hot or cold environment for the qubit, as desired. Furthermore,
introducing superconducting quantum interference devices (SQUIDs) into the
resistor cavity provides control of the coupling strength between this
artificial environment and the qubit. We demonstrate that our scheme allows us
to couple strongly to the environment enabling rapid initialization of the
system, and by subsequent tuning of the magnetic flux of the SQUIDs we may
greatly reduce the resistor-qubit coupling, allowing the qubit to evolve
unhindered.