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Can Anomalous Amplification be Attained without Postselection?

Julián Martínez-Rincón1,2, Wei-Tao Liu1,3,2, Gerardo I Viza1,2

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This study introduces a new parameter estimation method using joint measurements. The technique enhances measurement sensitivity and precision, even with technical noise, by amplifying weak interactions.

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Area of Science:

  • Quantum metrology
  • Precision measurement science

Background:

  • Traditional weak-value amplification approximations can limit precision.
  • Technical noise often degrades the performance of measurement systems.

Purpose of the Study:

  • To develop a parameter estimation technique robust to technical noise.
  • To enhance measurement sensitivity and precision beyond conventional methods.

Main Methods:

  • Performing joint measurements of weak interactions beyond the weak-value-amplification approximation.
  • Utilizing two detectors to capture correlations between weakly entangled degrees of freedom.
  • Inducing amplification in the difference signal of detectors for noise robustness.

Main Results:

  • The proposed protocol collects all Fisher information for parameter estimation.
  • A tunable phase controls the amplification strength.
  • Experimental demonstration showed increased effective sensitivity and precision compared to conventional balanced detection, even with technical noise.

Conclusions:

  • The developed technique offers enhanced precision metrology.
  • It provides robustness against technical noise through balanced signal amplification.
  • This method advances parameter estimation in noisy environments.