Quantum 7, 980 (2023). https://doi.org/10.22331/q-2023-04-13-980 Device-independent (DI) protocols, such as DI conference key agreement (DICKA) and DI randomness expansion (DIRE), certify private randomness by observing nonlocal correlations when two or more parties test a Bell […]
Quantum 7, 979 (2023). https://doi.org/10.22331/q-2023-04-13-979 A web of cohomological facts relates quantum error correction, measurement-based quantum computation, symmetry protected topological order and contextuality. Here we extend this web to quantum computation with magic states. In […]
Quantum 7, 978 (2023). https://doi.org/10.22331/q-2023-04-13-978 Extracting classical information from quantum systems is an essential step of many quantum algorithms. However, this information could be corrupted as the systems are prone to quantum noises, and its […]
Quantum 7, 977 (2023). https://doi.org/10.22331/q-2023-04-13-977 Simulating many-body quantum systems is a promising task for quantum computers. However, the depth of most algorithms, such as product formulas, scales with the number of terms in the Hamiltonian, […]
Quantum 7, 976 (2023). https://doi.org/10.22331/q-2023-04-13-976 Quantum homomorphic encryption, which allows computation by a server directly on encrypted data, is a fundamental primitive out of which more complex quantum cryptography protocols can be built. For such […]
Quantum 7, 975 (2023). https://doi.org/10.22331/q-2023-04-13-975 Mapping fermionic operators to qubit operators is an essential step for simulating fermionic systems on a quantum computer. We investigate how the choice of such a mapping interacts with the […]
Quantum 7, 974 (2023). https://doi.org/10.22331/q-2023-04-13-974 We analyze the barren plateau phenomenon in the variational optimization of quantum circuits inspired by matrix product states (qMPS), tree tensor networks (qTTN), and the multiscale entanglement renormalization ansatz (qMERA). […]
Quantum 7, 973 (2023). https://doi.org/10.22331/q-2023-04-06-973 Continuous-time measurements are instrumental for a multitude of tasks in quantum engineering and quantum control, including the estimation of dynamical parameters of open quantum systems monitored through the environment. However, […]
Quantum 7, 972 (2023). https://doi.org/10.22331/q-2023-04-06-972 Driven quantum systems subject to non-Markovian noise are typically difficult to model even if the noise is classical. We present a systematic method based on generalized cumulant expansions for deriving […]
Quantum 7, 971 (2023). https://doi.org/10.22331/q-2023-04-06-971 We consider how to define a natural probability distribution over worlds within a simple class of deterministic many-worlds theories. This can help us understand the typical properties of worlds within […]
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