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Improving the estimation of environment parameters via a two-qubit scheme
Ali Raza Mirza1,2, Adam Zaman Chaudhry3
1School of Science and Engineering, Lahore University of Management Sciences (LUMS), Opposite Sector U, D.H.A, Lahore, 54792, Pakistan.
Scientific Reports
|March 22, 2024
Summary
Using two qubits significantly enhances environment parameter estimation over single qubits. This quantum sensing approach improves precision by orders of magnitude for key environmental properties.
Area of Science:
- Quantum Information Science
- Quantum Sensing
- Quantum Dynamics
Background:
- Quantum systems are sensitive to environmental parameters.
- Single-qubit measurements can be limited in precision.
- Common environments can induce indirect interactions between qubits.
Purpose of the Study:
- To demonstrate the advantage of using two coupled qubits for estimating environmental parameters.
- To quantify the improvement in estimation precision compared to a single-qubit approach.
- To investigate the role of indirect qubit-environment interactions in enhancing sensing capabilities.
Main Methods:
- Theoretical modeling of two qubits coupled to a common harmonic oscillator environment.
- Analysis of the reduced density matrix for a single qubit within the two-qubit system.
- Quantification of estimation precision using the quantum Fisher information.
Main Results:
- The two-qubit scheme shows drastically improved estimation of environment parameters (cutoff frequency, coupling strength, temperature).
- An indirect interaction factor, arising from the common environment, significantly enhances precision.
- Precision improvements are orders of magnitude greater than those achievable with a single qubit.
Conclusions:
- Two-qubit systems coupled to a common environment offer superior quantum sensing capabilities.
- Indirect interactions mediated by the environment are crucial for enhanced parameter estimation.
- This approach provides a powerful tool for precise characterization of quantum environments.
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