In the annals of human achievement, the development of the computer stands as one of the most transformative. From the colossal, room-filling machines of the mid-20th century to the sleek smartphones that fit in our pockets, computers have become an indispensable part of our daily lives. Yet, as we push the boundaries of classical computing, we find ourselves at a crossroads, with quantum computing emerging as the beacon that could lead us into a new era of technological proficiency.
Classical computers, those that operate on bits and bytes, have been the workhorses of the digital age. Their compute power has doubled roughly every two years, a trend known as Moore’s Law. However, we are fast approaching the physical limits of silicon-based technology. Transistors, the building blocks of classical computers, cannot shrink indefinitely, and as they approach the size of atoms, quantum effects begin to interfere with their operation. This looming impasse suggests that we may soon reach the zenith of what classical computers can achieve.
Quantum computing represents a paradigm shift in computation. Unlike classical computers, which use bits that can be either 0 or 1, quantum computers use qubits that can be both 0 and 1 simultaneously, thanks to a phenomenon known as superposition. This, coupled with entanglement, another quantum marvel, allows quantum computers to process a vast number of possibilities at once.
The human brain is an extraordinary organ, estimated to possess the computational capacity equivalent to hundreds of millions of qubits. In contrast, the most powerful quantum computer to date boasts only 400 qubits today. This stark disparity underscores the nascent state of quantum technology but also hints at its staggering potential. Despite the current gap in computational power, quantum computers are already making steps in various fields.
They are being used to simulate molecular interactions, optimize logistics, and even develop new materials. This is possible because even a quantum computer with a modest number of qubits can perform certain calculations that are infeasible for classical computers, such as factoring large numbers, which has profound implications for cryptography. Quantum computers have the potential to break many of the encryption algorithms that secure our digital communications. In response, researchers are developing quantum-resistant encryption methods to safeguard data against future quantum attacks. This cat-and-mouse game between encryption and decryption is leading to a new era of cybersecurity. Here, I must mention prof. Artur Ekert who is best known as one of the pioneers of quantum cryptography. He moved cryptography to the next level thanks to the development of quantum key distribution protocol (QKD) which is based on the principles of quantum entanglement and Bell’s theorem.
The concept of quantum supremacy – the point at which a quantum computer can perform a calculation that a classical computer cannot – has been a driving force in the field. However, the pursuit of quantum supremacy has had an unexpected side effect: it has spurred the development of more efficient classical algorithms. As researchers strive to demonstrate the superiority of quantum computers, they are inadvertently discovering ways to make classical algorithms faster and more capable. One of the notable improvements to a classical algorithm influenced by quantum computing research involves the work on the “Boson Sampling” problem. This problem, which is believed to be intractable for classical computers, was used to demonstrate quantum advantage. However, a classical algorithm was later developed by female student of the University of Texas at Austin that could simulate the outcome of a boson sampling experiment in a more efficient manner than previously thought possible. This advancement reduced the computation time significantly, challenging the initial claims of quantum advantage and showing that classical algorithms could still compete in areas where quantum computers were believed to be superior.
The history of computing is replete with the contributions of women, from Ada Lovelace, who is credited with writing the first computer algorithm, to the women codebreakers of Bletchley Park during World War II. Today, women continue to play a vital role in the advancement of computer science and cryptography. Their diverse perspectives and innovative approaches are essential in tackling the complex challenges posed by quantum computing.
As we stand on the edge of the quantum revolution, it is imperative that we inspire the next generation to embrace this technology. Young minds, unencumbered by the limitations of classical thinking, are our best hope for unlocking the full potential of quantum computing. By encouraging curiosity and providing education in quantum technologies, we can ensure that the future is shaped by those who understand and can use this powerful tool. This gap can’t be closed without your support!
Maciej Kuske,
Head of Technology at Natwest Poland
