Ultra-sensitive phase estimation with white light

Abstract

An improvement of the scheme by Brunner and Simon [Phys. Rev. Lett. 105, 010405 (2010)] is proposed in order to show that quantum weak measurements can provide a method to detect ultrasmall longitudinal phase shifts, even with white light. By performing an analysis in the frequency domain, we find that the amplification effect will work as long as the spectrum is large enough, irrespective of the behavior in the time domain. As such, the previous scheme can be notably simplified for experimental implementations.

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• Quantum circuits for measuring weak values, Kirkwood--Dirac quasiprobability distributions, and state spectra
• Optimal Probe Wavefunction of Weak-Value Amplification
• Measurement of sub-pulse-width temporal delays via spectral interference induced by weak value amplification
• Protecting weak measurements against systematic errors
• Ultra-small phase estimation via weak measurement technique with postselection
• Toward Ultra-high Sensitivity in Weak Value Amplification
• Suppressing technical noises in weak measurement by entanglement
• Observation of spectral interference for any path difference in an interferometer
• Adaptive weak-value amplification with adjustable postselection
• Complementary weak-value amplification with concatenated postselections
• A Robust Interferometry Against Imperfections Base on Weak Value Amplification
• Auto-correlative weak-value amplification under strong noise background
• Dimension-independent weak value estimation via controlled SWAP operations
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• Weak-measurement-based pseudospin pointer: A cost-effective scheme for precision measurement
• Weak value amplification: a view from quantum estimation theory that highlights what it is and what isn't