Quantum Computing
Quantum computing hardware, modalities, architectures, companies, roadmaps, ecosystem dynamics, and the path to fault tolerance.
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Quantum Computing
A Comprehensive Guide to Quantum Gates
In quantum computing, the role of logic gates is played by quantum gates – unitary transformations on one or more qubits. These are the elementary “moves” that a quantum computer can perform on quantum data. Just as classical gates compose…
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Quantum Computing
Quantum Fourier Transform (QFT)
Quantum Fourier Transform (QFT), like a physical Fourier transform, takes a time-domain wave and represents it in the frequency domain. In the quantum case, the “time-domain” is the computational basis amplitude distribution, and the “frequency-domain” is another basis where the…
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Quantum Computing
Hadamard Gate: The Gateway to Superposition
The Hadamard gate takes a qubit and puts it into an equal superposition of “0” and “1” (with a relative phase of + or -). It has a simple matrix but a profound impact: it enables parallelism and interference in…
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Quantum Computing
Quantum Superposition: How Qubits Live in Many States at Once
Quantum computing promises to solve problems that stump even the fastest classical supercomputers. At the heart of this promise is a mind-bending phenomenon: quantum superposition. In simple terms, superposition allows quantum bits—or qubits—to occupy multiple states at the same time,…
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Quantum Computing
Colliding Waves: How Quantum Interference Powers Quantum Computing
Quantum interference remains the cornerstone of quantum computing’s promise. It’s the feature that distinguishes quantum computation from just a random quantum jumble. A quantum computer is not powerful simply because it can have many states at once – if that…
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Quantum Computing
Understanding “Polynomial Time” – Why Faster Algorithms Matter
Quantum computing has emerged as a new frontier of great-power competition in the 21st century. Nations around the world view advanced quantum technologies as strategic assets—keys to future economic prowess, military strength, and technological sovereignty. Governments have already poured over…
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Quantum Computing
Key Principles and Theorems in Quantum Computing and Networks
The landscape of quantum computing and quantum networks is an exciting frontier where physics and cybersecurity intersect. We’re witnessing the early days of this quantum revolution. As quantum hardware scales and quantum protocols move from labs to real-world deployment, security…
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Quantum Computing
Qubits: A Brief Introduction for Cybersecurity Professionals
A qubit is the quantum analog of a classical bit – it’s the basic unit of quantum information. However, unlike a classical bit that can only be 0 or 1 at any given time, a qubit can exist in a…
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Quantum Computing
Bell States: An Introduction for Cybersecurity Professionals
Bell states are a set of four specific quantum states of two qubits (quantum bits) that are entangled. In simple terms, an entangled pair of qubits behaves as one system, no matter how far apart they are. Bell states are…
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Post-Quantum, PQC, Quantum Security
Kuperberg’s Algorithm and its Impact on Post-Quantum Cryptography (PQC)
Kuperberg’s algorithm is an impressive quantum algorithmic achievement that expands the boundary of what quantum computers might do beyond the original realm of Shor’s algorithm. It demonstrates that even some non-trivial group problems (like the dihedral hidden subgroup problem) are…
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Quantum Computing
Balancing Quantum Computing Hype and Hope
Quantum computing stands at the intersection of immense promise and intense hype. As someone who had led cybersecurity teams (including serving as an interim CISO for Fortune 500 companies) and was now investing in a quantum computing startup, I found…
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Quantum Computing
Why I Chose Photonic Quantum Computing
Choosing photonic quantum computing for my startup is equal parts ambition and pragmatism. The ambition is that photons, with their long coherence and networking talent, could unlock scalable quantum computers without the cryogenic baggage of other approaches. The pragmatism was…
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Quantum Computing
Quantum Computing Hype and Fear: Same Song, New Verse
Another year, another wave of "quantum computers are about to crack all our encryption" fear-mongering. It’s 2012, and I’m getting déjà vu reading headlines proclaiming the imminent doom of RSA and other cryptography. I've been writing about this for at…
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Quantum Computing
Quantum Computers Intro
I remember the first time I heard the phrase “quantum computer” about a ten years ago. I pictured something out of a sci-fi movie - maybe a glowing box humming with mystical power. As a techie who spends a lot…
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Quantum Computing
Quantum Computing Hardware Update
In summary, as 2006 ends I remain confident yet realistic. We’ve seen genuine, hard-won progress in quantum hardware: superconducting circuits entangling, ions scaling up with superb control, photons performing logic, and even completely different technologies proving their quantum chops. We’ve…
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