  Josephson parametric converters (JPCs) are superconducting devices capable of
performing nondegenerate, three-wave mixing in the microwave domain without
losses. One drawback limiting their use in scalable quantum architectures is
the large footprint of the auxiliary circuit needed for their operation, in
particular, the use of off-chip, bulky, broadband hybrids and magnetic coils.
Here, we realize a JPC which eliminates the need for these bulky components.
The pump drive and flux bias are applied in the new device through an on-chip,
lossless, three-port power divider and on-chip flux line, respectively. We show
that the new design considerably simplifies the circuit and reduces the
footprint of the device while maintaining a comparable performance to
state-of-the-art JPCs. Furthermore, we exploit the tunable bandwidth property
of the JPC and the added capability of applying alternating currents to the
flux line in order to switch the resonance frequencies of the device, hence
demonstrating time-multiplexed amplification of microwave tones that are
separated by more than the dynamical bandwidth of the amplifier. Such a
measurement technique can potentially serve to perform time-multiplexed,
high-fidelity readout of superconducting qubits.
