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Related Experiment Video

Updated: Aug 29, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Bifurcation Oscillator as an Advanced Sensor for Quantum State Control.

Dmitrii Pashin¹, Marina Bastrakova^1,2, Arkady Satanin^3,4

¹Faculty of Physics, Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia.

Sensors (Basel, Switzerland)

|September 9, 2022

Summary

We developed a new qubit measurement method using a Josephson oscillator. This technique leverages the oscillator

Keywords:

bifurcation entanglement measurement of superposition qubit states nonlinear oscillator qubit

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Last Updated: Aug 29, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 11, 2013

Area of Science:

Quantum computing and quantum information science.
Superconducting circuit quantum electrodynamics.

Background:

Josephson oscillators coupled to superconducting qubits exhibit complex bifurcation behavior.
The dynamic equilibrium state of the oscillator is sensitive to the qubit's quantum state.

Purpose of the Study:

To present a novel measurement method for superconducting qubit superposition states.
To investigate the quantum-mechanical behavior and entanglement dynamics between a bifurcation oscillator and a qubit.

Main Methods:

Studying the bifurcation behavior of a high-quality (high-Q) Josephson oscillator coupled to a superconducting qubit.
Analyzing the influence of qubit states on oscillator transition probabilities near the classical separatrix.
Investigating quantum-mechanical aspects of the bifurcation oscillator and entanglement mechanisms.

Main Results:

The capture probability into dynamic equilibrium is demonstrably sensitive to qubit states.
A new measurement method for qubit superposition states is proposed, exploiting this sensitivity.
Optimal parameters for driving current and oscillator state were identified for high-precision one-qubit gates with minimal back-action.
A protocol for measuring state populations of entangled qubit-oscillator systems was developed.

Conclusions:

The proposed measurement method offers a sensitive approach to detecting qubit superposition states.
Understanding the quantum-mechanical behavior of the bifurcation oscillator is crucial for qubit-oscillator entanglement.
The findings facilitate the development of precise quantum gates and measurement protocols in superconducting circuits.