Quantum 8, 1543 (2024). https://doi.org/10.22331/q-2024-12-03-1543 It was recently found that the indefinite causal order in the quantum switch can be certified device-independently when assuming the impossibility of superluminal influences. Here we strengthen this result in […]
Quantum 8, 1542 (2024). https://doi.org/10.22331/q-2024-11-27-1542 We introduce and experimentally test a machine-learning-based method for ranking logically equivalent quantum circuits based on expected performance estimates derived from a training procedure conducted on real hardware. We apply […]
Quantum 8, 1541 (2024). https://doi.org/10.22331/q-2024-11-27-1541 Implementing robust quantum error correction (QEC) is imperative for harnessing the promise of quantum technologies. We introduce a framework that takes $any$ classical code and explicitly constructs the corresponding QEC […]
Quantum 8, 1540 (2024). https://doi.org/10.22331/q-2024-11-27-1540 We developed new concentration inequalities for a quantum state on an $N$-qudit system or measurement outcomes on it that apply to an adversarial setup, where an adversary prepares the quantum […]
Quantum 8, 1539 (2024). https://doi.org/10.22331/q-2024-11-26-1539 A promising route towards fault-tolerant quantum error correction is the concatenation of a Gottesman-Kitaev-Preskill (GKP) code with a qubit code. Development of such concatenated codes requires simulation tools which realistically […]
Quantum 8, 1538 (2024). https://doi.org/10.22331/q-2024-11-26-1538 The unitary coupled cluster (UCC) ansatz is a promising tool for achieving high-precision results using the variational quantum eigensolver (VQE) algorithm in the NISQ era. However, results on quantum hardware […]
Quantum 8, 1537 (2024). https://doi.org/10.22331/q-2024-11-26-1537 We study the problem of learning the Hamiltonian of a many-body quantum system from experimental data. We show that the rate of learning depends on the amount of control available […]
Quantum 8, 1536 (2024). https://doi.org/10.22331/q-2024-11-26-1536 The Quantum Cheshire Cat experiment showed that when weak measurements are performed on pre- and post-selected system, the counterintuitive result has been obtained that a neutron is measured to be […]
Quantum 8, 1535 (2024). https://doi.org/10.22331/q-2024-11-25-1535 We present a novel formalism to both understand and construct mixers that preserve a given subspace. The method connects and utilizes the stabilizer formalism that is used in error correcting […]
Quantum 8, 1534 (2024). https://doi.org/10.22331/q-2024-11-21-1534 We derive a Markovian master equation that models the evolution of systems subject to driving and control fields. Our approach combines time rescaling and weak-coupling limits for the system-environment interaction […]
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