bit, 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.
Tunable electromagnetic environment for superconducting quantum bits
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 quantum