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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Erasing distinguishability using quantum frequency up-conversion.

Hiroki Takesue¹

¹NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, Japan. htakesue@will.brl.ntt.co.jp

Physical Review Letters

|November 13, 2008

Summary

This summary is machine-generated.

Researchers erased frequency distinguishability in single photons using frequency up-conversion. This quantum interference technique enables more flexible quantum networking for various photon wavelengths.

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Area of Science:

Quantum optics
Photonics
Quantum information science

Background:

Quantum entanglement and indistinguishability are crucial for quantum information processing.
Controlling photon frequency is essential for wavelength-multiplexed quantum networks.
Spontaneous four-wave mixing (SFWM) is a common source for photon pairs.

Purpose of the Study:

To demonstrate the erasure of frequency distinguishability in single photons.
To enable the use of photons with different frequencies in quantum networking.
To enhance the flexibility of quantum information systems.

Main Methods:

Emulating two telecom-band single photons with different frequencies but the same temporal mode using SFWM.
Converting photon frequencies to a single frequency via sum-frequency generation (SFG) in periodically poled lithium niobate (PPLN) waveguides.
Maintaining temporal indistinguishability during frequency conversion.

Main Results:

Successfully erased frequency distinguishability between two single photons.
Achieved frequency-converted photons that exhibited a nonclassical dip in a Hong-Ou-Mandel quantum interference experiment.
Demonstrated the preservation of temporal indistinguishability after frequency conversion.

Conclusions:

Frequency up-conversion is an effective method for erasing frequency distinguishability.
The developed scheme enhances networking capabilities for quantum information systems.
This technique offers greater flexibility in utilizing photons across various wavelengths for quantum communication.