A Josephson Junction Microscope for Low-frequency Fluctuators
arXiv:0705.1380 · doi:10.1103/PhysRevLett.99.137002
Abstract
The high-Q harmonic oscillator mode of a Josephson junction can be used as a novel probe of spurious two-level systems (TLSs) inside the amorphous oxide tunnel barriers of the junction. In particular, we show that spectroscopic transmission measurements of the junction resonator mode can reveal how the coupling magnitude between the junction and the TLSs varies with an external magnetic field applied in the plane of the tunnel barrier. The proposed experiments offer the possibility of clearly resolving the underlying coupling mechanism for these spurious TLSs, an important decoherence source limiting the quality of superconducting quantum devices.
4 pages, 3 figures
References in corpus (9)
- Resolving photon number states in a superconducting circuit
- State tomography of capacitively shunted phase qubits with high fidelity
- Model for l/f Flux Noise in SQUIDs and Qubits
- Low- and high-frequency noise from coherent two-level systems
- Microwave-Induced Cooling of a Superconducting Qubit
- Quantum two-level systems in Josephson junctions as naturally formed qubits
- Temperature square dependence of the low frequency 1/f charge noise in the Josephson junction qubits
- Rabi oscillations in a qubit coupled to a quantum two-level system
- Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction