Quantum 6, 824 (2022). https://doi.org/10.22331/q-2022-09-29-824 Variational Quantum Algorithms (VQAs) have received considerable attention due to their potential for achieving near-term quantum advantage. However, more work is needed to understand their scalability. One known scaling result […]
Quantum 6, 823 (2022). https://doi.org/10.22331/q-2022-09-29-823 This paper proposes a method of quantum Monte Carlo integration that retains the full quadratic quantum advantage, without requiring any arithmetic or quantum phase estimation to be performed on the […]
Quantum 6, 822 (2022). https://doi.org/10.22331/q-2022-09-29-822 Top-performance sources of photonic entanglement are an indispensable resource for many applications in quantum communication, most notably quantum key distribution. However, up to now, no source has been shown to […]
Quantum 6, 821 (2022). https://doi.org/10.22331/q-2022-09-29-821 Bosonic qubits encoded in continuous-variable systems provide a promising alternative to two-level qubits for quantum computation and communication. So far, photon loss has been the dominant source of errors in […]
Quantum 6, 820 (2022). https://doi.org/10.22331/q-2022-09-29-820 Top quarks represent unique high-energy systems since their spin correlations can be measured, thus allowing to study fundamental aspects of quantum mechanics with qubits at high-energy colliders. We present here […]
Quantum 6, 819 (2022). https://doi.org/10.22331/q-2022-09-22-819 Quantum key distribution, which allows two distant parties to share an unconditionally secure cryptographic key, promises to play an important role in the future of communication. For this reason such […]
Quantum 6, 818 (2022). https://doi.org/10.22331/q-2022-09-22-818 Entanglement is the defining characteristic of quantum mechanics. Bipartite entanglement is characterized by the von Neumann entropy. Entanglement is not just described by a number, however; it is also characterized […]
Quantum 6, 817 (2022). https://doi.org/10.22331/q-2022-09-22-817 We develop two general approaches to characterising the manipulation of quantum states by means of probabilistic protocols constrained by the limitations of some quantum resource theory. First, we give a […]
Quantum 6, 816 (2022). https://doi.org/10.22331/q-2022-09-22-816 Quantum many-body systems involving bosonic modes or gauge fields have infinite-dimensional local Hilbert spaces which must be truncated to perform simulations of real-time dynamics on classical or quantum computers. To […]
Quantum 6, 815 (2022). https://doi.org/10.22331/q-2022-09-22-815 We propose an extension to the Pauli stabiliser formalism that includes fractional $2pi/N$ rotations around the $Z$ axis for some integer $N$. The resulting generalised stabiliser formalism – denoted the […]
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