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Explainer: What is a quantum computer? - MIT Technology Review
But despite their efforts, noise still causes lots of errors to creep into calculations. Smart quantum algorithms can compensate for some of these, and adding more qubits also helps. However, it will likely take thousands of standard qubits to create a single, highly reliable one, known as a “logical” qubit. This will sap a lot of a quantum computer’s computational capacity.

And there’s the rub: so far, researchers haven’t been able to generate more than 128 standard qubits (see our qubit counter here). So we’re still many years away from getting quantum computers that will be broadly useful.
12 days ago by elrob
(165) Jessica Pointing at the 2018 Quantum Matters™ Science Communication Competition - YouTube
Jessica Pointing takes just 3 minutes to explain how quantum algorithms can organize quantum bits (qubits) for solving complex problems
24 days ago by hschilling
[1807.04271] A quantum-inspired classical algorithm for recommendation systems
A recommendation system suggests products to users based on data about user preferences. It is typically modeled by a problem of completing an m×n matrix of small rank k. We give the first classical algorithm to produce a recommendation in O(poly(k)polylog(m,n)) time, which is an exponential improvement on previous algorithms that run in time linear in m and n. Our strategy is inspired by a quantum algorithm by Kerenidis and Prakash: like the quantum algorithm, instead of reconstructing a user's full list of preferences, we only seek a randomized sample from the user's preferences. Our main result is an algorithm that samples high-weight entries from a low-rank approximation of the input matrix in time independent of m and n, given natural sampling assumptions on that input matrix. As a consequence, we show that Kerenidis and Prakash's quantum machine learning (QML) algorithm, one of the strongest candidates for provably exponential speedups in QML, does not in fact give an exponential speedup over classical algorithms.
recommendations  algorithms  quantum-computing  classical-computing  rather-interesting  information-theory  to-understand 
6 weeks ago by Vaguery

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