20 citations · 38 across the 3 of their papers we have counts for
3 papers · 1 filter
Macroscopic tunnel splittings in superconducting phase qubits
Philip R. Johnson, William T. Parsons, Frederick W. Strauch +4
Prototype Josephson-junction based qubit coherence times are too short for quantum computing. Recent experiments probing superconducting phase qubits have revealed previously unsee…
Quantum logic gates for coupled superconducting phase qubits
Frederick W. Strauch, Philip R. Johnson, Alex J. Dragt +3
Based on a quantum analysis of two capacitively coupled current-biased Josephson junctions, we propose two fundamental two-qubit quantum logic gates. Each of these gates, when supp…
Decoherence in a Josephson junction qubit
A. J. Berkley, H. Xu, M. A. Gubrud +4
The zero-voltage state of a Josephson junction biased with constant current consists of a set of metastable quantum energy levels. We probe the spacings of these levels by using mi…