Date: 22 Jan 2026
This article is the fourth blog in a continuing series based on excerpts from the book Quantum Communications by Gianfranco Cariolaro, exploring how quantum theory has evolved into practical technologies shaping the future of communication and information security.
Quantum Mechanics was originally developed to explain physical phenomena at atomic and subatomic scales. Over the last few decades, its principles have expanded far beyond physics into the realm of information science and technology. This shift is driven by the postulates of Quantum Mechanics, which have remained experimentally valid for nearly a century and have enabled entirely new ways of processing, transmitting, and securing information.
These foundational principles have given rise to revolutionary applications such as quantum computing, quantum cryptography, quantum coding, and quantum communications. Once theoretical, many of these ideas have now been experimentally verified and are the focus of today’s global research activity.
The origins of quantum information can be traced back to the 1960s, following the discovery of the laser. This breakthrough led to the development of the quantum theory of optical coherence and later to the Theory of Quantum Telecommunications, which treated information as a quantum entity governed by the laws of Quantum Mechanics. Although early efforts were limited by technological constraints and overshadowed by the rise of optical fibres. These pioneering studies laid the groundwork for modern quantum information science. Today, quantum communication concepts are being revisited, particularly for deep-space applications where they are expected to play a critical role.
A major driver behind the development of quantum information was the realization that classical computing technologies would eventually reach physical limits. As electronic components shrink toward atomic scales, quantum effects become unavoidable. This led to the idea of reformulating information processing using Quantum Mechanics, resulting in the concept of the quantum computer. Unlike classical systems, quantum computers exploit quantum parallelism, allowing them to perform certain computations far more efficiently.
During this period, researchers also explored secure communication based on quantum principles. Quantum cryptography emerged from the fundamental property that any attempt to intercept quantum information disturbs the system and reveals the intrusion. The discovery of quantum entanglement further enabled advanced techniques such as superdense coding and quantum teleportation, expanding the possibilities of information transmission beyond classical limits.
A defining milestone came with the development of Shor’s algorithm, which demonstrated that a quantum computer could factor large numbers efficiently, posing a serious challenge to traditional cryptographic systems and highlighting the urgency of quantum-safe security solutions.
While early advancements focused on discrete quantum variables, known as qubits. However, recent progress has revealed continuous quantum variables as a strong and effective alternative. Continuous-variable approaches benefit from mature theoretical tools and practical laboratory implementations, opening new avenues for quantum communication and information processing.
In essence, Quantum Information exists in two complementary forms: discrete and continuous. Together, they form the foundation of a rapidly evolving field that is reshaping computation, communication, and security, and defining the technologies of the future.
Quantum Information: From Physics to the Technologies of the Future
Quantum Mechanics has evolved far beyond explaining atomic phenomena. Today, its principles are shaping how we compute, communicate, and secure information.
From the discovery of the laser to quantum computing, cryptography, entanglement, and Shor’s algorithm, quantum information has transformed from theory into experimentally proven technologies. As classical systems approach their physical limits, quantum approaches, both qubit-based and continuous-variable are redefining what is possible.
Quantum Information underpins the next era of computing, secure communications, and quantum-safe security, shaping the future of the digital world.
Read more on Quantum Communication website:
#QuantumInformation #QuantumTechnology #QuantumComputing #QuantumCryptography #FutureTech
Quantum Information: From Physics to the Technologies of the Future
Quantum mechanics has evolved from explaining atomic behavior into a foundation for quantum information technologies, driving breakthroughs in computing, secure communication, and quantum-safe security.
