Quantum 7, 932 (2023). https://doi.org/10.22331/q-2023-03-02-932 Device-independent quantum key distribution (DI-QKD) is often seen as the ultimate key exchange protocol in terms of security, as it can be performed securely with uncharacterised black-box devices. The advent […]
Quantum 7, 931 (2023). https://doi.org/10.22331/q-2023-02-21-931 We introduce $Perceval$, an open-source software platform for simulating and interfacing with discrete-variable photonic quantum computers, and describe its main features and components. Its Python front-end allows photonic circuits to […]
Quantum 7, 930 (2023). https://doi.org/10.22331/q-2023-02-21-930 Local Hamiltonians of fermionic systems on a lattice can be mapped onto local qubit Hamiltonians. Maintaining the locality of the operators comes at the expense of increasing the Hilbert space […]
Quantum 7, 929 (2023). https://doi.org/10.22331/q-2023-02-21-929 We introduce an efficient decoder of the color code in $dgeq 2$ dimensions, the Restriction Decoder, which uses any $d$-dimensional toric code decoder combined with a local lifting procedure to […]
Quantum 7, 928 (2023). https://doi.org/10.22331/q-2023-02-21-928 The Hayden-Preskill protocol is a qubit-toy model of the black hole information paradox. Based on the assumption of scrambling, it was revealed that quantum information is instantly leaked out from […]
Quantum 7, 927 (2023). https://doi.org/10.22331/q-2023-02-21-927 We classify the different ways in which matrix product states (MPSs) can stay invariant under the action of matrix product operator (MPO) symmetries. This is achieved through a local characterization […]
Quantum 7, 926 (2023). https://doi.org/10.22331/q-2023-02-16-926 Einstein-Podolsky-Rosen (EPR) steering is often (implicitly or explicitly) taken to be evidence for spooky action-at-a-distance. An alternative perspective on steering is that Alice has no causal influence on the physical […]
Quantum 7, 925 (2023). https://doi.org/10.22331/q-2023-02-16-925 NISQ devices have several physical limitations and unavoidable noisy quantum operations, and only small circuits can be executed on a quantum machine to get reliable results. This leads to the […]
Quantum 7, 924 (2023). https://doi.org/10.22331/q-2023-02-16-924 By encoding logical qubits into specific types of photonic graph states, one can realize quantum repeaters that enable fast entanglement distribution rates approaching classical communication. However, the generation of these […]
Quantum 7, 923 (2023). https://doi.org/10.22331/q-2023-02-16-923 Coupling to the environment typically suppresses quantum properties of physical systems via decoherence mechanisms. This is one of the main obstacles in practical implementations of quantum protocols. In this work […]
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