Quantum Two-Level Systems in Josephson Junctions as Naturally Formed Qubits
- 14 August 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 97 (7), 077001
- https://doi.org/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 can be considered as a multiqubit register. It can be coupled to other junctions 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.Keywords
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This publication has 12 references indexed in Scilit:
- Rabi oscillations in a qubit coupled to a quantum two-level systemNew Journal of Physics, 2006
- Decoherence in Josephson Qubits from Dielectric LossPhysical Review Letters, 2005
- Superconducting Circuits and Quantum InformationPhysics Today, 2005
- Tunneling Spectroscopy of Two-Level Systems Inside a Josephson JunctionPhysical Review Letters, 2005
- Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast ReadoutPhysical Review Letters, 2004
- Decoherence in Josephson Phase Qubits from Junction ResonatorsPhysical Review Letters, 2004
- Entangled Macroscopic Quantum States in Two Superconducting QubitsScience, 2003
- Decoherence of a superconducting qubit due to bias noisePhysical Review B, 2003
- Tunable Coupling of Superconducting QubitsPhysical Review Letters, 2003
- Josephson-junction qubits with controlled couplingsNature, 1999