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Measurement of the decay of Fock states in a superconducting quantum circuit
H. Wang, M. Hofheinz, M. Ansmann +8
We demonstrate the controlled generation of Fock states with up to 15 photons in a microwave coplanar waveguide resonator coupled to a superconducting phase qubit. The subsequent d…
Uncollapsing of a quantum state in a superconducting phase qubit
Nadav Katz, Matthew Neeley, M. Ansmann +8
We demonstrate in a superconducting qubit the conditional recovery ("uncollapsing") of a quantum state after a partial-collapse measurement. A weak measurement extracts information…
Transformed Dissipation in Superconducting Quantum Circuits
Matthew Neeley, M. Ansmann, Radoslaw C. Bialczak +7
Superconducting quantum circuits must be designed carefully to avoid dissipation from coupling to external control circuitry. Here we introduce the concept of current transformatio…
Microwave Dielectric Loss at Single Photon Energies and milliKelvin Temperatures
Aaron D. O'Connell, M. Ansmann, R. C. Bialczak +9
The microwave performance of amorphous dielectric materials at very low temperatures and very low excitation strengths displays significant excess loss. Here, we present the loss t…
High-fidelity gates in a Josephson qubit
Erik Lucero, M. Hofheinz, M. Ansmann +7
We demonstrate new experimental procedures for measuring small errors in a superconducting quantum bit (qubit). By carefully separating out gate and measurement errors, we construc…