Quantum 7, 1208 (2023). https://doi.org/10.22331/q-2023-12-18-1208 We give a novel procedure for approximating general single-qubit unitaries from a finite universal gate set by reducing the problem to a novel magnitude approximation problem, achieving an immediate improvement […]
A tiny ball of brain cells hums with activity as it sits atop an array of electrodes. For two days, it receives a pattern of electrical zaps, each stimulation encoding the speech peculiarities of eight […]
Quantum 7, 1207 (2023). https://doi.org/10.22331/q-2023-12-14-1207 In quantum key distribution (QKD), protocols are tailored to adopt desirable experimental attributes, including high key rates, operation in high noise levels, and practical security considerations. The round-robin differential phase […]
Quantum 7, 1206 (2023). https://doi.org/10.22331/q-2023-12-12-1206 Learning a hidden property of a quantum system typically requires a series of interactions. In this work, we formalise such multi-round learning processes using a generalisation of classical-quantum states, called […]
Quantum 7, 1205 (2023). https://doi.org/10.22331/q-2023-12-12-1205 We describe a pipeline approach to decoding the surface code using minimum weight perfect matching, including taking into account correlations between detection events. An independent no-communication parallelizable processing stage reweights […]
Quantum 7, 1204 (2023). https://doi.org/10.22331/q-2023-12-12-1204 Photons are the physical system of choice for performing experimental tests of the foundations of quantum mechanics. Furthermore, photonic quantum technology is a main player in the second quantum revolution, […]
Quantum 7, 1203 (2023). https://doi.org/10.22331/q-2023-12-11-1203 Quantum information-processing techniques enable work extraction from a system’s inherently quantum features, in addition to the classical free energy it contains. Meanwhile, the science of computational mechanics affords tools for […]
This week, IBM announced a pair of shiny new quantum computers. The company’s Condor processor is the first quantum chip of its kind with over 1,000 qubits, a feat that would have made big headlines […]
Quantum 7, 1202 (2023). https://doi.org/10.22331/q-2023-12-06-1202 We describe a simple algorithm for estimating the $k$-th normalized Betti number of a simplicial complex over $n$ elements using the path integral Monte Carlo method. For a general simplicial […]
Quantum 7, 1201 (2023). https://doi.org/10.22331/q-2023-12-06-1201 In this work, we apply the advantage distillation method to improve the performance of a practical twin-field quantum key distribution system under collective attack. Compared with the previous analysis result […]
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