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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

A high-speed tunable beam splitter for feed-forward photonic quantum information processing.

Xiao-Song Ma¹, Stefan Zotter, Nuray Tetik

¹Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria. xiaosong.ma@univie.ac.at

|November 24, 2011

Summary

Researchers developed a fast, tunable beam splitter for quantum computing using path qubits. This device enables high-contrast quantum gates and efficient feed-forward operations, advancing quantum information processing.

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Area of Science:

Quantum Information Science
Quantum Optics
Photonics

Background:

Implementing high-fidelity quantum gates is crucial for scalable quantum computing.
Path qubits offer a robust encoding scheme, but require efficient manipulation tools.

Purpose of the Study:

To develop and demonstrate a high-speed, polarization-independent, and tunable beam splitter for path qubits.
To enable fast and efficient single- and two-qubit gates for quantum information processing.

Main Methods:

Utilized two electro-optical modulators in a Mach-Zehnder interferometer to create a tunable beam splitter.
Employed heralded single photons to test the performance of the beam splitter.
Demonstrated tunable feed-forward operations for single-qubit gates and measurement-induced interaction for two-qubit gates.

Main Results:

Achieved a polarization-independent interference contrast above 95% with heralded single photons.
Demonstrated a switching time of approximately 5.6 ns and a maximal repetition rate of 2.5 MHz.
Successfully implemented tunable single-qubit gates and two-qubit gates using the developed device.

Conclusions:

The developed tunable beam splitter is a promising component for high-speed quantum information processing with path qubits.
The device enables efficient control over quantum states, paving the way for more complex quantum circuits.