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Published on: November 11, 2013
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A driven Kerr oscillator with two-fold degeneracies for qubit protection
Jayameenakshi Venkatraman1,2, Rodrigo G Cortiñas1,2, Nicholas E Frattini1,2
1Department of Applied Physics, Yale University, New Haven, CT 06520.
Summary
Researchers demonstrated controllable spectral degeneracies in a Kerr oscillator using a squeezing drive. This allows for on-demand tuning of degeneracies, creating protected quantum states for enhanced noise protection.
Area of Science:
- Quantum Optics
- Quantum Information Science
- Nonlinear Optics
Background:
- Kerr oscillators are fundamental in quantum optics for generating nonlinear phenomena.
- Spectral degeneracies in quantum systems can offer pathways to enhanced coherence and noise protection.
- Controlling quantum states in driven systems remains a key challenge in quantum information science.
Purpose of the Study:
- To experimentally investigate spectral degeneracies in a driven Kerr oscillator.
- To explore the tunability of these degeneracies and their relationship with system parameters.
- To leverage these degeneracies for creating robust quantum states, such as protected cat qubits.
Main Methods:
- Utilized a Kerr oscillator subjected to a squeezing drive generated via three-wave mixing.
- Created an effective static two-well potential in the phase space by combining Kerr interaction and squeezing drive.
- Analyzed spectral degeneracies by adjusting the frequency of the squeezing drive and observing the oscillator's spectrum.
Main Results:
- Observed multiple simultaneous two-fold spectral degeneracies in the Kerr oscillator.
- Demonstrated that degeneracies can be turned on/off and their number controlled by adjusting the squeezing drive frequency.
- Found that [Formula: see text] exact, parity-protected degeneracies emerge when detuning Δ is an even multiple of Kerr coefficient K ([Formula: see text]).
- Identified destructive interference of tunnel paths in the effective double-well potential as the mechanism for degeneracies.
- Achieved a peaked enhancement of the incoherent well-switching lifetime, creating a protected cat qubit.
Conclusions:
- The study experimentally confirms the creation and control of spectral degeneracies in a driven Kerr oscillator.
- These degeneracies are linked to destructive quantum interference and provide a mechanism for noise protection.
- The findings pave the way for developing robust quantum information processing elements, like protected cat qubits.
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