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Tunneling spectroscopy of two-level systems inside a Josephson junction
I Martin1, L Bulaevskii, A Shnirman
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Physical Review Letters
|October 4, 2005
Summary
This study shows how a two-level system (TLS) inside a Josephson junction can be characterized by detecting Rabi oscillations. These oscillations reveal the TLS
Area of Science:
- Quantum electronics
- Solid-state physics
- Quantum information science
Background:
- Josephson junctions are fundamental in quantum electronics.
- Two-level systems (TLS) can impact quantum device performance.
- Characterizing TLS is crucial for quantum computing applications.
Purpose of the Study:
- To investigate the interaction between a TLS and Josephson oscillations.
- To develop a method for characterizing TLS within Josephson junctions.
- To quantify the TLS contribution to decoherence in qubit applications.
Main Methods:
- Modeling a voltage-biased, resistor-shunted Josephson junction containing a TLS.
- Analyzing Rabi-driven oscillations when the TLS modulates Josephson energy or is optically active.
- Utilizing noise measurements to detect current and voltage oscillations.
Main Results:
- Rabi oscillations occur in the TLS when driven by Josephson oscillations near resonance.
- These Rabi oscillations induce detectable current and voltage fluctuations.
- The observed oscillations allow for full TLS characterization.
Conclusions:
- Noise measurements can detect Rabi oscillations induced by a TLS in a Josephson junction.
- This method enables comprehensive TLS characterization and decoherence analysis.
- The findings are relevant for developing robust superconducting qubits.