Quantum theory has been successfully validated in numerous laboratory experiments. But
would such a theory, which effectively describes the behavior of microscopic physical …

Quantum key distribution (QKD) constitutes a symmetric secret key negotiation protocol
capable of maintaining information-theoretic security. Given the recent advances in QKD …

In principle, quantum key distribution (QKD) offers information-theoretic security based on
the laws of physics. In practice, however, the imperfections of realistic devices might …

Concerted efforts are underway to establish an infrastructure for a global quantum Internet to
realise a spectrum of quantum technologies. This will enable more precise sensors, secure …

Photonic quantum technologies represent a promising platform for several applications,
ranging from long-distance communications to the simulation of complex phenomena …

Long-distance entanglement distribution is essential for both foundational tests of quantum
physics and scalable quantum networks. Owing to channel loss, however, the previously …

Quantum key distribution (QKD) uses individual light quanta in quantum superposition states
to guarantee unconditional communication security between distant parties. However, the …

Quantum key distribution (QKD) promises unconditional security in data communication and
is currently being deployed in commercial applications. Nonetheless, before QKD can be …

In the past, long-distance free-space quantum communication experiments could only be
implemented at night. During the daytime, the bright background sunlight prohibits quantum …

Secure communication is crucial in the Internet Age, and quantum mechanics stands poised
to revolutionize cryptography as we know it today. In this Review, we introduce the …