Exchange-Free Computation on an Unknown Qubit at a Distance

TL;DR

This paper introduces a method for manipulating and controlling an unknown qubit remotely without exchanging particles, enabling exchange-free quantum state preparation and computation on distant quantum systems.

Contribution

It presents a novel protocol for exchange-free manipulation of unknown qubits and remote quantum computation, expanding the capabilities of quantum communication and control.

Findings

Protocol enables exchange-free state preparation at a distance

Allows direct remote enactment of quantum algorithms

Demonstrates exchange-free control of universal two-qubit gates

Abstract

We present a way of directly manipulating an arbitrary qubit, without the exchange of any particles. This includes as an application the exchange-free preparation of an arbitrary quantum state at Alice by a remote classical Bob. As a result, we are able to propose a protocol that allows one party to directly enact, by means of a suitable program, any computation exchange-free on a remote second party's unknown qubit. Further, we show how to use this for the exchange-free control of a universal two-qubit gate, thus opening the possibility of directly enacting any desired algorithm remotely on a programmable quantum circuit.