Quantum state tomography (QST) aims at reconstructing the state of a quantum system. However, in conventional QST, the number of measurements scales exponentially with the number of qubits. Here, we propose a QST protocol, in which the introduction of a threshold allows one to drastically reduce the number of measurements required for the reconstruction of the state density matrix without compromising the result accuracy. In addition, one can also use the same approach to reconstruct an approximated density matrix tailoring the number of measurements on the available resources. We experimentally demonstrate this protocol by performing the tomography of states up to 7 qubits. We show that our approach can lead to results in agreement with those obtained by QST even when the number of measurements is reduced by more than two orders of magnitude.

A tailor-made quantum state tomography approach / Binosi, D.; Garberoglio, G.; Maragnano, D.; Dapor, M.; Liscidini, M.. - In: APL QUANTUM. - ISSN 2835-0103. - 1:3(2024), p. 036112. [10.1063/5.0219143]

A tailor-made quantum state tomography approach

Garberoglio, G.;Dapor, M.;
2024-01-01

Abstract

Quantum state tomography (QST) aims at reconstructing the state of a quantum system. However, in conventional QST, the number of measurements scales exponentially with the number of qubits. Here, we propose a QST protocol, in which the introduction of a threshold allows one to drastically reduce the number of measurements required for the reconstruction of the state density matrix without compromising the result accuracy. In addition, one can also use the same approach to reconstruct an approximated density matrix tailoring the number of measurements on the available resources. We experimentally demonstrate this protocol by performing the tomography of states up to 7 qubits. We show that our approach can lead to results in agreement with those obtained by QST even when the number of measurements is reduced by more than two orders of magnitude.
2024
3
Binosi, D.; Garberoglio, G.; Maragnano, D.; Dapor, M.; Liscidini, M.
A tailor-made quantum state tomography approach / Binosi, D.; Garberoglio, G.; Maragnano, D.; Dapor, M.; Liscidini, M.. - In: APL QUANTUM. - ISSN 2835-0103. - 1:3(2024), p. 036112. [10.1063/5.0219143]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/429673
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
  • OpenAlex ND
social impact