Quantum 7, 934 (2023). https://doi.org/10.22331/q-2023-03-02-934 We propose a new method to extend the size of a quantum computation beyond the number of physical qubits available on a single device. This is accomplished by randomly inserting […]
Category: quantumjournal
Quantum 7, 933 (2023). https://doi.org/10.22331/q-2023-03-02-933 A fundamental computational problem is to find a shortest non-zero vector in Euclidean lattices, a problem known as the Shortest Vector Problem (SVP). This problem is believed to be hard […]
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 […]
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