Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Cyril Branciard"'
Publikováno v:
Quantum, Vol 8, p 1514 (2024)
Causal nonseparability is the property underlying quantum processes incompatible with a definite causal order. So far it has remained a central open question as to whether any process with a clear physical realisation can violate a causal inequality,
Externí odkaz:
https://doaj.org/article/d265ccfad2a240f1bfe273627420c19c
Autor:
Vittorio Vitale, Aniket Rath, Petar Jurcevic, Andreas Elben, Cyril Branciard, Benoît Vermersch
Publikováno v:
PRX Quantum, Vol 5, Iss 3, p 030338 (2024)
We present the experimental measurement, on a quantum processor, of a series of polynomial lower bounds that converge to the quantum Fisher information (QFI), a fundamental quantity for certifying multipartite entanglement that is useful for metrolog
Externí odkaz:
https://doaj.org/article/4dcc06711c35464eb21f14aafe121102
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-14 (2023)
Quantum theory can describe scenarios with an indefinite causal order, but whether such processes could be witnessed in real scenarios by violating causal inequalities is still subject to debate. Here, the authors give an affirmative answer, showing
Externí odkaz:
https://doaj.org/article/cc2e8898498046bf9b92bda4a1126a42
Publikováno v:
PRX Quantum, Vol 4, Iss 3, p 030901 (2023)
Externí odkaz:
https://doaj.org/article/250e5585044c42448d0e920572b9958c
Autor:
Marco Fellous-Asiani, Raphaël Mothe, Léa Bresque, Hippolyte Dourdent, Patrice A. Camati, Alastair A. Abbott, Alexia Auffèves, Cyril Branciard
Publikováno v:
Physical Review Research, Vol 5, Iss 2, p 023111 (2023)
Quantum mechanics allows processes to be superposed, leading to a genuinely quantum lack of causal structure. For example, the process known as the quantum switch applies two operations A and B in a superposition of the two possible orders, A before
Externí odkaz:
https://doaj.org/article/2ea840a9e6624d01b021fa431b283bf5
Autor:
Aniket Rath, Vittorio Vitale, Sara Murciano, Matteo Votto, Jérôme Dubail, Richard Kueng, Cyril Branciard, Pasquale Calabrese, Benoît Vermersch
Publikováno v:
PRX Quantum, Vol 4, Iss 1, p 010318 (2023)
The operator entanglement (OE) is a key quantifier of the complexity of a reduced density matrix. In out-of-equilibrium situations, e.g., after a quantum quench of a product state, it is expected to exhibit an entanglement barrier. The OE of a reduce
Externí odkaz:
https://doaj.org/article/67a1177b64224cc0808a18b509737dbf
Publikováno v:
PRX Quantum, Vol 2, Iss 3, p 030335 (2021)
Quantum supermaps are transformations that map quantum operations to quantum operations. It is known that quantum supermaps which respect a definite, predefined causal order between their input operations correspond to fixed-order quantum circuits, a
Externí odkaz:
https://doaj.org/article/6fd9c2b8bd684a88a2c579cd9ea77400
Computational Advantage from the Quantum Superposition of Multiple Temporal Orders of Photonic Gates
Autor:
Márcio M. Taddei, Jaime Cariñe, Daniel Martínez, Tania García, Nayda Guerrero, Alastair A. Abbott, Mateus Araújo, Cyril Branciard, Esteban S. Gómez, Stephen P. Walborn, Leandro Aolita, Gustavo Lima
Publikováno v:
PRX Quantum, Vol 2, Iss 1, p 010320 (2021)
Models for quantum computation with circuit connections subject to the quantum superposition principle have recently been proposed. In them, a control quantum system can coherently determine the order in which a target quantum system undergoes N gate
Externí odkaz:
https://doaj.org/article/81c9d7373c1d4e989760d095be050823
Autor:
Giulia Rubino, Lee A. Rozema, Daniel Ebler, Hlér Kristjánsson, Sina Salek, Philippe Allard Guérin, Alastair A. Abbott, Cyril Branciard, Časlav Brukner, Giulio Chiribella, Philip Walther
Publikováno v:
Physical Review Research, Vol 3, Iss 1, p 013093 (2021)
In quantum communication networks, wires represent well-defined trajectories along which quantum systems are transmitted. In spite of this, trajectories can be used as a quantum control to govern the order of different noisy communication channels, a
Externí odkaz:
https://doaj.org/article/69c02f9cae1e4226b94f4a6365f2c71a
Publikováno v:
Quantum, Vol 4, p 333 (2020)
A completely depolarising quantum channel always outputs a fully mixed state and thus cannot transmit any information. In a recent Letter\cite{ebler18}, it was however shown that if a quantum state passes through two such channels in a quantum superp
Externí odkaz:
https://doaj.org/article/0fcf8e7355074eb5b88a1dc2e1bf1220