Quantum two-level systems in Josephson junctions as naturally formed qubits
arXiv:cond-mat/0603753 · doi:10.1103/PhysRevLett.97.077001
Abstract
The two-level systems (TLSs) naturally occurring in Josephson junctions constitute a major obstacle for the operation of superconducting phase qubits. Since these TLSs can possess remarkably long decoherence times, we show that such TLSs can themselves be used as qubits, allowing for a well controlled initialization, universal sets of quantum gates, and readout. Thus, a single current-biased Josephson junction (CBJJ) can be considered as a multiqubit register. It can be coupled to other CBJJs to allow the application of quantum gates to an arbitrary pair of qubits in the system. Our results indicate an alternative way to realize superconducting quantum information processing.
Reference added
References in corpus (4)
Cited by in corpus (14)
- Quantum information processing with circuit quantum electrodynamics
- Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior
- Entanglement of superconducting qubits via microwave fields: classical and quantum regimes
- Macroscopic Periodic Tunneling of Fermi Atoms in the BCS-BEC Crossover
- Anomalous avoided level crossings in a Cooper-pair box spectrum
- Quantum Information Processing with Delocalized Qubits under Global Control
- Quantum mechanical approach to decoherence and relaxation generated by fluctuating environment
- Relaxation of Josephson qubits due to strong coupling to two-level systems
- Microscopic model of critical current noise in Josephson-junction qubits: Subgap resonances and Andreev bound states
- Nonlinear Landau-Zener Processes in a Periodic Driving Field
- A Josephson Junction Microscope for Low-frequency Fluctuators
- Quantum information processing using frequency control of impurity spins in diamond
- Probing internal bath dynamics by a Rabi oscillator-based detector
- Realistic quantum manipulation of two-level system fluctuators