Quantum 6, 673 (2022). https://doi.org/10.22331/q-2022-03-29-673 Non-causal correlations certify the lack of a definite causal order among localized space-time regions. In stark contrast to scenarios where a single region influences its own causal past, some processes […]
Quantum 6, 672 (2022). https://doi.org/10.22331/q-2022-03-22-672 Thermal machines exploit interactions with multiple heat baths to perform useful tasks, such as work production and refrigeration. In the quantum regime, tasks with no classical counterpart become possible. Here, […]
Quantum 6, 671 (2022). https://doi.org/10.22331/q-2022-03-22-671 How can a multipartite single-photon path-entangled state be certified efficiently by means of local measurements? We address this question by constructing an entanglement witness based on local photon detections preceded […]
Quantum strongly condemns the 2022 invasion of Ukraine, the loss of life and war crimes inflicted by Vladimir Putin’s forces. There are no words to express our sorrow and fears. Lego house with an Ukrainian flag, […]
Quantum 6, 670 (2022). https://doi.org/10.22331/q-2022-03-17-670 We propose to perform amplitude estimation with the help of constant-depth quantum circuits that variationally approximate states during amplitude amplification. In the context of Monte Carlo (MC) integration, we numerically […]
Quantum 6, 669 (2022). https://doi.org/10.22331/q-2022-03-17-669 We propose a quantum repeater architecture that can operate under ambient conditions. Our proposal builds on recent progress towards non-cryogenic spin-photon interfaces based on nitrogen-vacancy centers, which have excellent spin […]
Quantum 6, 668 (2022). https://doi.org/10.22331/q-2022-03-17-668 Valiant-Vazirani showed in 1985 [45] that solving NP with the promise that “yes” instances have only one witness is powerful enough to solve the entire NP class (under randomized reductions). […]
Quantum 6, 667 (2022). https://doi.org/10.22331/q-2022-03-11-667 Quantum error correcting codes (QECCs) are the means of choice whenever quantum systems suffer errors, e.g., due to imperfect devices, environments, or faulty channels. By now, a plethora of families […]
Quantum 6, 666 (2022). https://doi.org/10.22331/q-2022-03-11-666 In this paper we describe an algebraic/geometrical approach to quantum scrambling. Generalized quantum subsystems are described by an hermitian-closed unital subalgebra $cal A$ of operators evolving through a unitary channel. […]
Quantum 6, 665 (2022). https://doi.org/10.22331/q-2022-03-10-665 Multiparameter quantum estimation is made difficult by the following three obstacles. First, incompatibility among different physical quantities poses a limit on the attainable precision. Second, the ultimate precision is not […]
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