List of quantum processors

List of companies involved in quantum computing or communication

Timeline of quantum computing and communication

What is Quantum Computing? Top 18 Quantum Computing Companies in 2020

Quantum computing

Tau.Neutrino said:

List of quantum processors

List of companies involved in quantum computing or communication

Timeline of quantum computing and communication

What is Quantum Computing? Top 18 Quantum Computing Companies in 2020

Quantum computing

> https://en.wikipedia.org/wiki/Timeline_of_quantum_computing_and_communication

There’s a heck of a lot on that.link. Some recent highlights.

> 2017. D-Wave Systems Inc. announces general commercial availability of the D-Wave 2000Q quantum annealer, which it claims has 2000 qubits.

Annealing would be a simulated annealing algorithm. Simulated annealing on classical computers is abysmally slow, its advantage is that it’s dead easy to program and can be used for an enormously large number of problems. Any speed-up is worthwhile.

> 2017. Microsoft reveals Q Sharp, a quantum programming language integrated with Visual Studio

> 2019. Austrian physicists demonstrate self-verifying, hybrid, variational quantum simulation of lattice models in condensed matter and high-energy physics using a feedback loop between a classical computer and a quantum co-processor.

Lattice models in high energy physics really need speeding up. The mathematical simulations run way behind experimental data, and accuracy is not great. The slow improvement in accuracy means that a lot of observed subatomic particles still have unknown properties.

> 2019. Quantum Darwinism observed in diamond at room temperature.

“Quantum Darwinism is a theory meant to explain the emergence of the classical world from the quantum world as due to a process of Darwinian natural selection induced by the environment interacting with the quantum system; where the many possible quantum states are selected against in favor of a stable pointer state.” https://en.wikipedia.org/wiki/Quantum_Darwinism “quantum Darwinism seeks to explain how the classical world emerges from the quantum world and proposes to answer the quantum measurement problem, the main interpretational challenge for quantum theory”. Quantum Darwinism works by reproduction, time evolution and selection without mutation.

That looks promising as a way of reconciling the incompatibility of classical mechanics and quantum mechanics.

> 2020.

• UNSW Sydney develops a way of producing ‘hot qubits’ – quantum devices that operate at 1.5 Kelvin.
• Griffith University, UNSW and UTS, in partnership with seven universities in the United States, develop noise cancelling for quantum bits via machine learning, taking quantum noise in a quantum chip down to 0%.
• UNSW performs electric nuclear resonance to control single atoms in electronic devices.
• University of Tokyo and Australian scientists create and successfully test a solution to the quantum wiring problem, creating a 2D structure for qubits. Such structure can be built using existing integrated circuit technology and has a considerably lower cross-talk.

Australian content.

• Scientists report the development of the smallest synthetic molecular motor, consisting of 12 atoms and a rotor of 4 atoms, shown to be capable of being powered by an electric current using an electron scanning microscope and moving even with very low amounts of energy due to quantum tunnelling.

I’ve had an interest in molecular rotors for a while, as a way of probing the interface between quantum mechanics and classical mechanics.

• 28 August 2020 – Quantum engineers working for Google report the largest chemical simulation on a quantum computer – a Hartree-Fock approximation

Good on them. Hartree-Fock is well known as a difficult computational problem.