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Nonlinear coupling between the two oscillation modes of a dc SQUID.
F Lecocq1, J Claudon, O Buisson
1Institut Néel, CNRS-Université Joseph Fourier, BP 166, 38042 Grenoble-cedex 9, France.
Physical Review Letters
|December 21, 2011
Summary
We reveal strong coupling between two modes in a DC SQUID, enabling conditional quantum operations and entanglement. This unlocks new possibilities for quantum information processing using superconducting quantum interference devices.
Area of Science:
- Quantum Physics
- Superconducting Devices
- Quantum Information Science
Background:
- DC SQUIDs have two orthogonal phase oscillation modes: longitudinal and transverse.
- The longitudinal mode is established for quantum bit encoding, while the transverse mode is typically high-frequency and uninvolved.
- Controlling the transverse mode is key to unlocking new quantum functionalities.
Purpose of the Study:
- To theoretically describe the two-dimensional nature of DC SQUIDs.
- To analyze the coupling between the longitudinal and transverse phase oscillation modes.
- To explore the potential for enhanced quantum information processing via mode coupling.
Main Methods:
- Detailed theoretical description of DC SQUID dynamics.
- Analysis of mode coupling using a Hamiltonian.
- Investigation of device parameters influencing mode energy and coupling.
Main Results:
- Demonstrated that transverse mode energy can match longitudinal mode energy with typical parameters.
- Observed strong coupling between the two modes.
- Identified conditional quantum operations and entanglement as potential outcomes.
- Revealed an atomiclike structure with a V-like scheme for combined states.
Conclusions:
- Strong coupling between DC SQUID modes is achievable under realistic conditions.
- This coupling enables novel quantum effects like conditional operations and entanglement.
- The findings pave the way for advanced quantum information processing applications using DC SQUIDs.
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