Abstract
We present a scheme to use external quantum devices using the universal quantum computer previously constructed. We thereby show how the universal quantum computer can utilize networked quantum information resources to carry out local computations. Such information may come from specialized quantum devices or even from remote universal quantum computers. We show how to accomplish this by devising universal quantum computer programs that implement well known oracle based quantum algorithms, namely the Deutsch, Deutsch-Jozsa, and the Grover algorithms using external black-box quantum oracle devices. In the process, we demonstrate a method to map existing quantum algorithms onto the universal quantum computer.
Highlights
Quantum networks which connect quantum systems and can transmit quantum information have been extensively discussed [1]
Assuming that a classical solution to a problem directly applies to a quantum mechanical system is prone to run into potential complications
We address here the question of how a universal quantum computer can access an external oracle, which may be regarded as a ‘‘black box’’ quantum device, possibly over a quantum network but in any case as a separate and external quantum system to the universal quantum computer itself
Summary
Quantum networks which connect quantum systems and can transmit quantum information have been extensively discussed [1]. UQC uses a halting scheme that allows for valid program concatenation, resolving issues with the original Universal Quantum Turing Machine (UQTM) proposed by Deutsch [4]. Without loss of generality, that quantum network nodes have an ‘‘enable’’ qubit, jenT, that controls when an access is to begin, in order to let the device know when the input data has been prepared and is valid.
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