Qucor Pty Limited

Andrew Greentree

Alexander Rudolf Hamilton

Lloyd Christopher Leonard Hollenberg

Austin Fowler

Lloyd Hollenberg

Cameron Wellard

Ashley Stephens

Frederick Green

The correction of errors in the transport and processing of qubits makes use of logical qubits made up of a plurality of physical qubits. The process takes place on a spatial array of physical qubit sites arranged with a quasi-2-dimensional topology having a first line of physical qubit sites and second line of physical qubit sites, where the first and second lines are arranged in parallel, with the sites of the first line in registration with corresponding sites in the second line. Between the first and second lines of physical qubit sites are a plurality of logic function gates, each comprised of a first physical qubit gate site associated with a first physical qubit site in the first line, and a second physical qubit gate site associated with the physical qubit site in the second line that corresponds to the first physical qubit site. The temporal process comprises a number of steps to achieve movement of the qubits in the array to bring pairs of all the data and ancilla qubits to respective logic function gates over the course of a number of clock cycles. Then achieve the logic operation between each pair of data and ancilla qubits. Move the qubits in the array to bring all the data and ancilla qubits to respective sites where they can be read out. And, using the values of the ancilla qubits read out to correct errors arising in the data qubits they have been gated with.

Error corrected quantum computer

This invention concerns quantum computers in which the qubits are closed systems, in that the particle or particles are confined within the structure. A 'site' can be produced by any method of confining an electron or other quantum particle, such as a dopant atom, a quantum dot, a cooper pair box, or any combination of these. In particular the invention concerns a closed three-site quantum particle system. The state in the third site is weakly coupled by coherent tunneling to the first and second states, so that the third state is able to map out the populations of the first and second states as its energy is scanned with respect to the first and second states. In second and third aspects it concerns a readout method for a closed three-state quantum particle system.

Qubit readout via controlled coherent tunnelling to probe state

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Coburg, Australia

Andrew Greentree