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9 papers · 2 filters
Two-Qubit State Tomography using a Joint Dispersive Read-Out
S. Filipp, P. Maurer, P. J. Leek +8
Quantum state tomography is an important tool in quantum information science for complete characterization of multi-qubit states and their correlations. Here we report a method to…
Stationary and transient leakage current in the Pauli spin blockade
F. Qassemi, W. A. Coish, F. K. Wilhelm
We study the effects of cotunneling and a non-uniform Zeeman splitting on the stationary and transient leakage current through a double quantum dot in the Pauli spin blockade regim…
Randomized benchmarking and process tomography for gate errors in a solid-state qubit
J. M. Chow, J. M. Gambetta, L. Tornberg +7
We present measurements of single-qubit gate errors for a superconducting qubit. Results from quantum process tomography and randomized benchmarking are compared with gate errors o…
Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
Jan Fischer, W. A. Coish, D. V. Bulaev +1
We theoretically study the interaction of a heavy hole with nuclear spins in a quasi-two-dimensional III-V semiconductor quantum dot and the resulting dephasing of heavy-hole spin…
Controlling the spontaneous emission of a superconducting transmon qubit
A. A. Houck, J. A. Schreier, B. R. Johnson +8
We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far o…
Quantum nondemolition-like, fast measurement scheme for a superconducting qubit
I. Serban, B. L. T. Plourde, F. K. Wilhelm
We present a measurement protocol for a flux qubit coupled to a dc-Superconducting QUantum Interference Device (SQUID), representative of any two-state system with a controllable c…