About this Research Topic

Background

High-dimensional entanglement provides a promising approach for developing practical and large-scale quantum systems with enhanced control in quantum information processing. In the context of high-dimensional entanglement, time-frequency domains of entangled photons provide intrinsic multi-level Hilbert space dimensionality within a single optical spatial mode. This unique feature of time-frequency entanglement provides the generation, characterization, and manipulation of high-dimensional quantum states in extensive photonic systems. These systems have significant potential for advanced quantum information processing, secure communications, complex computation, metrology, sensing, and imaging.

One of the key applications of time-frequency high-dimensional entanglement is quantum cryptography. Quantum Key Distribution (QKD) has emerged as a groundbreaking technology with proven inherent security features. Traditional qubit-based QKD protocols, such as those utilizing polarization domain, are limited to a secret key capacity of one bit per photon. Conversely, qudit-based QKD protocols leverage time-frequency domains of entangled and classical photons, allowing for the transmission of multiple secret bits per photon, making them robust in noisy environments with scarce photons. By integrating high-dimensional QKD protocols, efficient error correction, and quantum memory across multiple Hilbert space dimensions, new type of quantum optical repeater can be explored. Such qudits are crucial for complex quantum computation, as d-level time-frequency entanglement allows for the construction of qudit and qubit logic gates, facilitating more efficient measurement-based quantum computation. The unique properties of the time-frequency degree-of-freedom also hold potential for enhanced performances in quantum metrology, sensing, and imaging tasks.

This Research Topic aims to advance robust, large-scale quantum information processing, communication, and computing systems utilizing the unique capabilities of time-frequency entangled photons in conjunction with classical light. To gather further insights into this evolving field, we welcome submissions that explore both theoretical and experimental facets of high-dimensional entanglement in quantum photonic systems. Articles of interest include but are not limited to:

• Experimental and theoretical studies on high-dimensional time-frequency entanglement for large-scale quantum information processing, including topics such as high-dimensional entanglement certification, multi-photon quantum state, high-dimensional quantum memory, time-frequency quantum logic gates, among others.
• Experimental and theoretical studies on time-frequency quantum information for quantum communication, such as large-alphabet time-frequency QKD, security of quantum cryptography, and quantum error correction, among others.
• Quantum metrology that is based on time-frequency entanglement of photons, including time-frequency quantum spectroscopy and quantum imaging, among others.

Article types and fees

This Research Topic accepts the following article types, unless otherwise specified in the Research Topic description:

• Brief Research Report
• Editorial
• General Commentary
• Methods
• Mini Review
• Opinion
• Original Research
• Perspective
• Review
• ... View all formats

Articles that are accepted for publication by our external editors following rigorous peer review incur a publishing fee charged to Authors, institutions, or funders.

Article types

This Research Topic accepts the following article types, unless otherwise specified in the Research Topic description:

• Brief Research Report
• Editorial
• General Commentary
• Methods
• Mini Review
• Opinion
• Original Research
• Perspective
• Review
• Technology and Code

Keywords: Quantum Information Processing, Quantum Key Distribution, Time-Frequency high-dimensional Entanglement, Quantum Communication, Quantum Memory, Quantum Logical Gates, Quantum Error Correction, Quantum Metrology, Quantum Imaging, Quantum Sensing

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