Coprocessors for quantum devices. / Kay, Alastair.

In: Physical Review A, Vol. 97, No. 3, 032316, 15.03.2018, p. 1-11.

Research output: Contribution to journalArticlepeer-review




Quantum devices, from simple fixed-function tools to the ultimate goal of a universal quantum computer, will require high quality, frequent repetition of a small set of core operations, such as the preparation of entangled states. These tasks are perfectly suited to realisation by a co-processor or supplementary instruction set, as is common practice in modern CPUs. In this paper, we present two quintessentially quantum co-processor functions: production of a GHZ state, and implementation of optimal universal (asymmetric) quantum cloning. Both are based on the evolution of a fixed Hamiltonian. We introduce a new numerical technique for deriving the parameters of these Hamiltonians based on the numerical integration of Toda-like flows.
Original languageEnglish
Article number032316
Pages (from-to)1-11
Number of pages11
JournalPhysical Review A
Issue number3
Publication statusPublished - 15 Mar 2018


This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

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