  We study a circuit, the Josephson sampler, that embeds a real vector into an
entangled state of n qubits, and optionally samples from it. We measure its
fidelity and entanglement on the 16-qubit ibmqx5 chip. To assess its
expressiveness, we also measure its ability to generate Haar random unitaries
and quantum chaos, as measured by Porter-Thomas statistics and
out-of-time-order correlation functions. The circuit requires nearest-neighbor
CZ gates on a chain and is especially well suited for first-generation
superconducting architectures.
