Quantum 8, 1284 (2024). https://doi.org/10.22331/q-2024-03-14-1284 We show how to find all $k$ marked elements in a list of size $N$ using the optimal number $O(sqrt{N k})$ of quantum queries and only a polylogarithmic overhead in […]
Category: quantumjournal
Quantum 8, 1283 (2024). https://doi.org/10.22331/q-2024-03-14-1283 It is useful to have a criterion for when the predictions of an operational theory should be considered classically explainable. Here we take the criterion to be that the theory […]
Quantum 8, 1282 (2024). https://doi.org/10.22331/q-2024-03-14-1282 In this article, we present a novel approach to investigating entanglement in the context of quantum computing. Our methodology involves analyzing reduced density matrices at different stages of a quantum […]
Quantum 8, 1281 (2024). https://doi.org/10.22331/q-2024-03-14-1281 Dynamically field-programmable qubit arrays (DPQA) have recently emerged as a promising platform for quantum information processing. In DPQA, atomic qubits are selectively loaded into arrays of optical traps that can […]
Quantum 8, 1280 (2024). https://doi.org/10.22331/q-2024-03-14-1280 Teleportation allows Alice to send a pre-prepared quantum state to Bob using only pre-shared entanglement and classical communication. Here we show that it is possible to teleport a state which […]
Quantum 8, 1279 (2024). https://doi.org/10.22331/q-2024-03-13-1279 Multi-qubit entangling interactions arise naturally in several quantum computing platforms and promise advantages over traditional two-qubit gates. In particular, a fixed multi-qubit Ising-type interaction together with single-qubit X-gates can be […]
Quantum 8, 1278 (2024). https://doi.org/10.22331/q-2024-03-13-1278 Subspace diagonalisation methods have appeared recently as promising means to access the ground state and some excited states of molecular Hamiltonians by classically diagonalising small matrices, whose elements can be […]
Quantum 8, 1277 (2024). https://doi.org/10.22331/q-2024-03-13-1277 Studies have shown that the Hilbert spaces of non-Hermitian systems require nontrivial metrics. Here, we demonstrate how evolution dimensions, in addition to time, can emerge naturally from a geometric formalism. […]
Quantum 8, 1276 (2024). https://doi.org/10.22331/q-2024-03-13-1276 We propose a systematic and efficient quantum circuit composed solely of Clifford gates for simulating the ground state of the surface code model. This approach yields the ground state of […]
Quantum 8, 1275 (2024). https://doi.org/10.22331/q-2024-03-07-1275 Variational quantum algorithms use non-convex optimization methods to find the optimal parameters for a parametrized quantum circuit in order to solve a computational problem. The choice of the circuit ansatz, […]
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