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arXiv:1903.10760quant-ph

When will we have a quantum computer?

M. I. Dyakonov

Abstract

At a given moment, the state of the hypothetical quantum computer with N qubits is characterized by 2^N quantum amplitudes, which are complex continuous variables restricted by the normalization condition only. Their values cannot be arbitrary, they must be under our control. For moderate N = 1000, the number of quantum amplitudes greatly exceeds the number of particles in the Universe. Thus the answer to the question in title is: When physicists and engineers will learn to keep under control this number of continuous parameters.

arXiv comments
4 pages, Talk at the conference "Future trends in microelectronics", Sardinia (2018). To be published in Special issue of Solid State Electronics (2019)
Journal reference
DOI
Subjects
quant-phQuantum Physics

On Hacker News

Linked by 2 identifiable commenters in 2 comments across 2 threads, from May 2019 to May 2019. Found in 1 HN submission from May 2019 to May 2019. Open submission discussions.

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Discussed in comments2 threads

  1. Microsoft, Brilliant team up to offer quantum curriculum 1 comment

    • Dyakonov‘s opinions have been rebutted by many prominent quantum information scientists and physicists. To put it charitably, his arguments don’t agree with the consensus. Check out [1] as an example criticism of his writing. [1] https://scirate.com/arxiv/1903.10760

      reikonomushaView on HNParent context

  2. How to factor 2048 bit RSA integers in 8 hours using 20M noisy qubits 1 comment

    • Hopefully we will see results way before we start breaking RSA. It looks like people are targeting applications in quantum chemistry [1]. Also, Dyakonov's criticisms are toothless, see comments here [2]. [1] https://arxiv.org/abs/1801.00862 [2]…

      mathgeniusView on HNParent context

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