Despite the great progress in development of quantum computing in recent years, much research is still very much needed on all fronts of quantum computing, and quantum information science overall, before the field is truly ready for commercialization and deployment of production-scale production-quality practical real-world applications to address production-scale real-world…


NISQ quantum computers are by definition noisy and intermediate scale. That begs the question of what to call a quantum computer which is not noisy or not intermediate scale. This informal paper proposes a collection of alternative terms which reflect the future arrival of quantum error correction (QEC) for fault-tolerant…


Achieving quantum advantage over classical computing is the holy grail goal of quantum computing, but that’s a very steep hill to climb. There is no generally accepted qualitative or numeric metric for how much of a performance advantage of a quantum solution over a classical solution constitutes true quantum advantage…


Despite the dramatic advances of quantum computing in recent years, I find it odd that there are no 40-qubit quantum algorithms or even 32-qubit quantum algorithms, even though there are several real quantum computers with more than 50 qubits and we have 40-qubit simulators. …


How can the designer of a quantum algorithm know that the algorithm will work for far more qubits than it has been tested or far more qubits than can be simulated (50 qubits max)? This informal paper proposes a model for design and testing of scalable quantum algorithms.

The ambitious…


There is more than one reason to simulate execution of a quantum circuit on a classical computer. This informal paper proposes a model of five distinct major use cases and a variety of access patterns for a classical quantum simulator. …


This informal paper documents my thoughts in recent months on IBM’s quantum hardware roadmap which they published on September 15, 2020, as well as their quantum software development and ecosystem roadmap published on February 4, 2021. …


The great promise of quantum computing is that an application running on a quantum computer should have a truly dramatic and compelling performance advantage over a comparable application running on a classical computer, not merely a minor to moderate performance advantage, but what defines dramatic? The ideal for quantum advantage…


For convenient reference, this informal paper presents the timeline of the notable computers during the early history of classical computing in the 20th century. …


Qubit fidelity is an urgent matter for quantum computing. Even with a large enough number of qubits, the fidelity of the qubits is a key gating factor in how useful a quantum computer can be. This informal paper will discuss the terminology used to discuss qubit fidelity as well as…

Jack Krupansky

Freelance Consultant

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