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Title: A controlled-NOT gate for frequency-bin qubits

Journal Article · · npj Quantum Information

The realization of strong photon–photon interactions has presented an enduring challenge across photonics, particularly in quantum computing, where two-photon gates form essential components for scalable quantum information processing (QIP). While linear-optic schemes have enabled probabilistic entangling gates in spatio-polarization encoding, solutions for many other useful degrees of freedom remain missing. In particular, no two-photon gate for the important platform of frequency encoding has been experimentally demonstrated, due in large part to the additional challenges imparted by the mismatched wavelengths of the interacting photons. In this article, we design and implement an entangling gate for frequency-bin qubits, a coincidence-basis controlled-NOT (CNOT), using line-by-line pulse shaping and electro-optic modulation. With this being said, we extract a quantum unitary fidelity of 0.91 ± 0.01 via a parameter inference approach based on Bayesian machine learning, which enables accurate gate reconstruction from measurements in the two-photon computational basis alone. Thus, our CNOT imparts a single-photon frequency shift controlled by the frequency of another photon—an important capability in itself—and should enable new directions in fiber-compatible QIP.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1502569
Journal Information:
npj Quantum Information, Vol. 5, Issue 1; ISSN 2056-6387
Publisher:
Nature Partner JournalsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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Cited By (13)

Quantum frequency combs and Hong–Ou–Mandel interferometry: the role of spectral phase coherence journal January 2019
Simulations of subatomic many-body physics on a quantum frequency processor journal July 2019
Robust Architecture for Programmable Universal Unitaries journal January 2020
High-dimensional optical quantum logic in large operational spaces journal July 2019
Temporal imaging for ultra-narrowband few-photon states of light journal January 2020
Quantum optical microcombs journal February 2019
Biphoton shaping with cascaded entangled-photon sources journal September 2019
Generating frequency-bin qubits via spontaneous four-wave mixing in a photonic molecule journal October 2019
High-dimensional optical quantum logic in large operational spaces text January 2018
Simulations of Subatomic Many-Body Physics on a Quantum Frequency Processor text January 2018
Generating frequency-bin qubits via spontaneous four-wave mixing in a photonic molecule text January 2019
Quantum frequency combs and Hong-Ou-Mandel interferometry: the role of spectral phase coherence text January 2019
Temporal imaging for ultra-narrowband few-photon states of light text January 2019

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