Quantum 7, 894 (2023). https://doi.org/10.22331/q-2023-01-13-894 This paper proposes and proves security of a QKD protocol which uses two-universal hashing instead of random sampling to estimate the number of bit flip and phase flip errors. This […]
Category: quantumjournal
Quantum 7, 893 (2023). https://doi.org/10.22331/q-2023-01-13-893 Quantum machine learning (QML) models based on parameterized quantum circuits are often highlighted as candidates for quantum computing’s near-term “killer application”. However, the understanding of the empirical and generalization performance […]
In 2023 Quantum will celebrate 6 years since the first publications! From that first batch of papers, the journal grew to nearly 900 published articles. This growth was made possible by our incredible team of editors, […]
Quantum 7, 892 (2023). https://doi.org/10.22331/q-2023-01-04-892 Quantum control aims to manipulate quantum systems toward specific quantum states or desired operations. Designing highly accurate and effective control steps is vitally important to various quantum applications, including energy […]
Quantum 7, 891 (2023). https://doi.org/10.22331/q-2023-01-03-891 Consistent dynamics which couples classical and quantum degrees of freedom exists, provided it is stochastic. This dynamics is linear in the hybrid state, completely positive and trace preserving. One application […]
Quantum 7, 890 (2023). https://doi.org/10.22331/q-2023-01-03-890 We show that $Omega(rd/epsilon)$ copies of an unknown rank-$r$, dimension-$d$ quantum mixed state are necessary in order to learn a classical description with $1 – epsilon$ fidelity. This improves upon […]
Quantum 7, 889 (2023). https://doi.org/10.22331/q-2023-01-03-889 Measuring the expectation value of the molecular electronic Hamiltonian is one of the challenging parts of the variational quantum eigensolver. A widely used strategy is to express the Hamiltonian as […]
Quantum 7, 888 (2023). https://doi.org/10.22331/q-2023-01-03-888 Recent advances in laser interactions with coherent free electrons have enabled to shape the electron’s quantum state. Each electron becomes a superposition of energy levels on an infinite quantized ladder, […]
Quantum 6, 887 (2022). https://doi.org/10.22331/q-2022-12-29-887 Spin squeezing inequalities (SSI) represent a major tool to probe quantum entanglement among a collection of few-level atoms, and are based on collective spin measurements and their fluctuations. Yet, for […]
Quantum 6, 886 (2022). https://doi.org/10.22331/q-2022-12-29-886 We study the emergence over time of a universal, uniform distribution of quantum states supported on a finite subsystem, induced by projectively measuring the rest of the system. Dubbed $textit{deep […]
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