Potential for ultrafast quantum communication

Sreraman Muralidharan, Liang Jiang

Siyu Song, Chuan Xi Wang

Byoung Seung HAM

A new type of ultrafast optical switching is demonstrated by using quantum coherence swapping in a four-level system. For potential applications of the quantum coherence swapping, hyper-THz optical switches in fiber-optic communications are discussed.

Andreas Christ, Benjamin Brecht, Georg Harder +4 more

Using ultrafast multimode PDC sources and optical quantum pulse gates based on engineered frequency conversion processes we introduce multiplexed quantum information coding and show that it enables an exponential increase in the achievable quantum communication rate.

William J. Munro, Simon J. Devitt, Ashley M. Stephens +3 more

Mohamed Sennary, Javier Rivera-Dean, Mohamed ElKabbash +3 more

Advancements in quantum optics and squeezed light generation have revolutionized various fields of quantum science over the past three decades, with notable applications such as gravitational wave detection. Here, we extend the use of squeezed light to the realm of ultrafast quantum science. We demonstrate the generation of the shortest ultrafast synthesized quantum light pulses spanning 0.33 to 0.73 PHz by a degenerate four-wave mixing nonlinear process. Experimental metrology results confirm that these pulses exhibit amplitude squeezing, which is consistent with theoretical predictions. Moreover, we observe the temporal dynamics of amplitude uncertainty of the squeezed light, demonstrating that quantum uncertainty of light is controllable and tunable in real time. Additionally, we demonstrate control over the quantum state of light by switching between amplitude and phase squeezing. Our ability to generate and manipulate ultrafast, squeezed, synthesized light waveforms with attosecond resolution unlocks exciting possibilities for quantum technologies, including petahertz-scale secure quantum communication, quantum computing, and ultrafast spectroscopy. As an example, we introduce an attosecond quantum encryption protocol leveraging squeezed synthesized light for secure digital communication at unprecedented speeds. This work paves the way for exploring quantum uncertainty dynamics and establishes the foundation for the emerging ultrafast and attosecond quantum science fields.