January 15, 2018\u00a0 13:30-15:00<\/p>\n
55N-2F Departments of Physics and Applied Physics Meeting Room, Nishi-Waseda Campus, Waseda University<\/p>\n
Daniel BURGARTH (Aberystwyth University)<\/p>\n
English<\/p>\n
Quantum simulators, machines that can replicate the dynamics of quantum systems, are being built as useful devices and are seen as a stepping stone to universal quantum computers. A key difference between the two is the ability to perform the logic gates that make up computational algorithms. We propose a method for learning how to construct these gates efficiently by using the simulator to perform optimal control on itself. This bypasses two major problems of purely classical approaches: the need to have an accurate model of the system, and a classical computer more powerful than the quantum one to carry out the optimisation. For numerical simulations of up to 9 qubits with Ising interactions, this in situ approach scales polynomially in the number of qubits for different topologies suggesting that this is a practical way of upgrading quantum simulators to computers.<\/p>\n