Quantum 6, 675 (2022). https://doi.org/10.22331/q-2022-03-30-675 The three key elements of a quantum simulation are state preparation, time evolution, and measurement. While the complexity scaling of time evolution and measurements are well known, many state preparation […]
Quantum 6, 674 (2022). https://doi.org/10.22331/q-2022-03-30-674 We investigate the interaction of weak light fields with two-dimensional lattices of atoms with high lying atomic Rydberg states. This system features different interactions that act on disparate length scales, […]
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 […]
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