Quantum 8, 1557 (2024). https://doi.org/10.22331/q-2024-12-10-1557 Quantum state preparation plays a crucial role in several areas of quantum information science, in applications such as quantum simulation, quantum metrology and quantum computing. However, typically state preparation requires […]
Quantum 8, 1556 (2024). https://doi.org/10.22331/q-2024-12-10-1556 Error-mitigation techniques such as probabilistic error cancellation and zero-noise extrapolation benefit from accurate noise models. The sparse Pauli-Lindblad noise model is one of the most successful models for those applications. […]
Quantum 8, 1555 (2024). https://doi.org/10.22331/q-2024-12-10-1555 Quantum sensors offer control flexibility during estimation by allowing manipulation by the experimenter across various parameters. For each sensing platform, pinpointing the optimal controls to enhance the sensor’s precision remains […]
Quantum 8, 1554 (2024). https://doi.org/10.22331/q-2024-12-10-1554 The parity mapping provides a geometrically local encoding of the Quantum Approximate Optimization Algorithm (QAOA), at the expense of having a quadratic qubit overhead for all-to-all connected problems. In this […]
Quantum 8, 1553 (2024). https://doi.org/10.22331/q-2024-12-10-1553 How well can quantum computers simulate classical dynamical systems? There is increasing effort in developing quantum algorithms to efficiently simulate dynamics beyond Hamiltonian simulation, but so far exact resource estimates […]
Quantum 8, 1552 (2024). https://doi.org/10.22331/q-2024-12-09-1552 Fault tolerant quantum computers repetitively apply a four-step procedure: First, perform a few one and two-qubit quantum gates. Second, perform a syndrome measurement on a subset of the qubits. Third, […]
Quantum 8, 1551 (2024). https://doi.org/10.22331/q-2024-12-04-1551 The exponential convergence to invariant subspaces of quantum Markov semigroups plays a crucial role in quantum information theory. One such example is in bosonic error correction schemes, where dissipation is […]
Quantum 8, 1550 (2024). https://doi.org/10.22331/q-2024-12-04-1550 Quasiprobability has become an increasingly popular notion for characterising non-classicality in quantum information, thermodynamics, and metrology. Two important distributions with non-positive quasiprobability are the Wigner function and the Glauber-Sudarshan function. […]
Quantum 8, 1549 (2024). https://doi.org/10.22331/q-2024-12-04-1549 We present a classical algorithm for simulating universal quantum circuits composed of “free” nearest-neighbour matchgates or equivalently fermionic-linear-optical (FLO) gates, and “resourceful” non-Gaussian gates. We achieve the promotion of the […]
Quantum 8, 1548 (2024). https://doi.org/10.22331/q-2024-12-04-1548 Gate-teleportation circuits are arguably among the most basic examples of computations believed to provide a quantum computational advantage: In seminal work [1], Terhal and DiVincenzo have shown that these circuits […]
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