Three-qubit direct dispersive parity measurement with Tunable Coupling Qubits
arXiv:1708.04175 · doi:10.1103/PhysRevB.96.214511
Abstract
We consider the direct three-qubit parity measurement scheme with two measurement resonators, using circuit quantum electrodynamics to analyze its functioning for several different types of superconducting qubits. We find that for the most common, transmon-like qubit, the presence of additional qubit-state dependent coupling terms of the two resonators hinders the possibility of performing the direct parity measurement. We show how this problem can be solved by employing the Tunable Coupling Qubit (TCQ) in a particular designed configuration. In this case, we effectively engineer the original model Hamiltonian by cancelling the harmful terms. We further develop an analysis of the measurement in terms of information gains and provide some estimates of the typical parameters for optimal operation with TCQs.
19 pages, 8 figures
References in corpus (7)
- Charge insensitive qubit design derived from the Cooper pair box
- Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
- Designing frequency-dependent relaxation rates and Lamb shift for a giant artificial atom
- Two-resonator circuit QED: A superconducting quantum switch
- Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
- A superconducting qubit with Purcell protection and tunable coupling
- Physical model of continuous two-qubit parity measurement in a cavity-QED network