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Exchange-Free Computation on an Unknown Qubit at a Distance

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arxiv 2008.00841 v4 pith:UETXBRHM submitted 2020-08-03 quant-ph

Exchange-Free Computation on an Unknown Qubit at a Distance

classification quant-ph
keywords exchange-freedirectlyqubitarbitrarycomputationpartyquantumremote
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 1 Pith paper

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  1. Interaction-free measurement of multiple objects using a universal integrated photonic processor

    quant-ph 2026-04 conditional novelty 7.0

    Experimental sequential interaction-free measurements of up to five objects with one photon on an integrated photonic processor confirm theoretical predictions after error mitigation.