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Quantum Process Tomography of a Universal Entangling Gate Implemented with Josephson Phase Qubits
Radoslaw C. Bialczak, Markus Ansmann, Max Hofheinz +9
Quantum logic gates must perform properly when operating on their standard input basis states, as well as when operating on complex superpositions of these states. Experiments usin…
Decoherence Dynamics of Complex Photon States in a Superconducting Circuit
H. Wang, M. Hofheinz, M. Ansmann +9
Quantum states inevitably decay with time into a probabilistic mixture of classical states, due to their interaction with the environment and measurement instrumentation. We presen…
Improving the Coherence Time of Superconducting Coplanar Resonators
H. Wang, M. Hofheinz, J. Wenner +10
The quality factor and energy decay time of superconducting resonators have been measured as a function of material, geometry, and magnetic field. Once the dissipation of trapped m…
Quantum logic with weakly coupled qubits
Michael R. Geller, Emily J. Pritchett, Andrei Galiautdinov +1
There are well-known protocols for performing CNOT quantum logic with qubits coupled by particular high-symmetry (Ising or Heisenberg) interactions. However, many architectures bei…
Energy Decay in Josephson Qubits from Non-equilibrium Quasiparticles
John M. Martinis, M. Ansmann, J. Aumentado
We calculate the energy decay rate of Josephson qubits and superconducting resonators from non-equilibrium quasiparticles. The decay rates from experiments are shown to be consiste…
Quasiparticle tunneling: P(E) theory
John M. Martinis
A calculation of the energy decay rate of a Josephson qubit from non-equilibrium quasiparticles is made using the environmental P(E) theory. For a large-capacitance qubit, we exten…