Self-testing is a method of quantum state and measurement estimation that does not rely on assumptions about the inner working of the devices used. Its experimental realization has been limited to sources producing single quantum states so far. In this work, we experimentally implement two significant building blocks of a quantum network involving two independent sources: namely, a parallel configuration, in which two parties share two copies of a state, and a tripartite configuration, where a central node shares two independent states with peripheral nodes. Then, by extending previous self-testing techniques, we provide device-independent lower bounds on the fidelity between the generated states and an ideal target made by the tensor product of two maximally entangled two-qubit states. Given its scalability and versatility, this technique can find application in the certification of larger networks of different topologies for quantum communication and cryptography tasks and randomness generation protocols.

Experimental robust self-testing of the state generated by a quantum network / Agresti, Iris; Polacchi, Beatrice; Poderini, Davide; Polino, Emanuele; Suprano, Alessia; Šupić, Ivan; Bowles, Joseph; Gonzalo, Carvacho; Cavalcanti, Daniel; Sciarrino, Fabio. - In: PRX QUANTUM. - ISSN 2691-3399. - 2:(2021). [10.1103/PRXQuantum.2.020346]

Experimental robust self-testing of the state generated by a quantum network

Iris Agresti;Beatrice Polacchi;Davide Poderini;Emanuele Polino;Alessia Suprano;Gonzalo Carvacho;Fabio Sciarrino
2021

Abstract

Self-testing is a method of quantum state and measurement estimation that does not rely on assumptions about the inner working of the devices used. Its experimental realization has been limited to sources producing single quantum states so far. In this work, we experimentally implement two significant building blocks of a quantum network involving two independent sources: namely, a parallel configuration, in which two parties share two copies of a state, and a tripartite configuration, where a central node shares two independent states with peripheral nodes. Then, by extending previous self-testing techniques, we provide device-independent lower bounds on the fidelity between the generated states and an ideal target made by the tensor product of two maximally entangled two-qubit states. Given its scalability and versatility, this technique can find application in the certification of larger networks of different topologies for quantum communication and cryptography tasks and randomness generation protocols.
2021
quantum information, quantum network, quantum causality
01 Pubblicazione su rivista::01a Articolo in rivista
Experimental robust self-testing of the state generated by a quantum network / Agresti, Iris; Polacchi, Beatrice; Poderini, Davide; Polino, Emanuele; Suprano, Alessia; Šupić, Ivan; Bowles, Joseph; Gonzalo, Carvacho; Cavalcanti, Daniel; Sciarrino, Fabio. - In: PRX QUANTUM. - ISSN 2691-3399. - 2:(2021). [10.1103/PRXQuantum.2.020346]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1556307
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