Characterization of an entangled system of two superconducting qubits using a multiplexed capacitance readout
arXiv:0812.2503 · doi:10.1103/PhysRevB.79.014516
Abstract
We characterize a pair of Cooper-pair boxes coupled with a fixed capacitor using spectroscopy and measurements of the ground-state quantum capacitance. We use the extracted parameters to estimate the concurrence, or degree of entanglement between the two qubits. We also present a thorough demonstration of a multiplexed quantum capacitance measurement technique, which is in principle scalable to a large array of superconducting qubits.
8 pages, 5 figures. Replaced version includes one additional reference, and figures which are better suited to grayscale
References in corpus (9)
- Coupling Superconducting Qubits via a Cavity Bus
- Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
- Spectroscopy on two coupled flux qubits
- Controllable coupling of superconducting flux qubits
- Consistency of ground state and spectroscopic measurements on flux qubits
- Four-qubit device with mixed couplings
- Fast quantum limited read-out of a superconducting qubit using a slow oscillator
- Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
- Measurement of the ground-state flux diagram of three coupled qubits as a first step towards the demonstration of adiabatic quantum computation