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Absolute Quantum Yield Measurement of Powder Samples

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Published on: May 12, 2012

Direct quantum process tomography via measuring sequential weak values of incompatible observables.

Yosep Kim¹, Yong-Su Kim², Sang-Yun Lee²

¹Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Korea.

Nature Communications

|January 17, 2018

Summary

This summary is machine-generated.

This study demonstrates the quantum nature of weak values using two-photon interference, enabling quantum process tomography for analyzing quantum channels and operations.

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Area of Science:

Quantum mechanics
Quantum information science
Quantum metrology

Background:

Weak value measurements are crucial for quantum measurement studies and metrology.
Existing experiments often rely on classical wave phenomena, not quantum mechanics.

Purpose of the Study:

To demonstrate the quantum mechanical nature of weak values.
To utilize sequential weak value measurements for quantum process tomography.

Main Methods:

Employing two-photon quantum interference to measure sequential weak values of incompatible observables.
Applying sequential weak value measurements to characterize quantum channels.

Main Results:

Successfully measured sequential weak values, requiring a quantum mechanical explanation.
Demonstrated the application of this technique for direct quantum process tomography of a qubit channel.

Conclusions:

The study confirms the inherently quantum nature of weak values.
Introduces novel applications for weak values in analyzing quantum operations and channels.