Quantum 7, 1019 (2023). https://doi.org/10.22331/q-2023-05-24-1019 Computing the key rate in quantum key distribution (QKD) protocols is a long standing challenge. Analytical methods are limited to a handful of protocols with highly symmetric measurement bases. Numerical […]
Quantum 7, 1018 (2023). https://doi.org/10.22331/q-2023-05-23-1018 We present an algorithm that uses block encoding on a quantum computer to exactly construct a Krylov space, which can be used as the basis for the Lanczos method to […]
Quantum 7, 1017 (2023). https://doi.org/10.22331/q-2023-05-23-1017 Bosonic Gaussian states are a special class of quantum states in an infinite dimensional Hilbert space that are relevant to universal continuous-variable quantum computation as well as to near-term quantum […]
Quantum 7, 1016 (2023). https://doi.org/10.22331/q-2023-05-23-1016 We study the phenomena of topological amplification in arrays of parametric oscillators. We find two phases of topological amplification, both with directional transport and exponential gain with the number of […]
Quantum 7, 1015 (2023). https://doi.org/10.22331/q-2023-05-23-1015 Relational Quantum Mechanics (RQM) claims to be an interpretation of quantum theory [20]. However, there are significant departures from quantum theory: (i) in RQM measurement outcomes arise from interactions which […]
Quantum 7, 1014 (2023). https://doi.org/10.22331/q-2023-05-23-1014 Physical unclonable functions(PUFs) provide a unique fingerprint to a physical entity by exploiting the inherent physical randomness. Gao et al. discussed the vulnerability of most current-day PUFs to sophisticated machine […]
Quantum 7, 1013 (2023). https://doi.org/10.22331/q-2023-05-23-1013 We propose a category-theoretic definition of retrodiction and use it to exhibit a time-reversal symmetry for all quantum channels. We do this by introducing retrodiction families and functors, which capture […]
Quantum 7, 1012 (2023). https://doi.org/10.22331/q-2023-05-22-1012 Metric adjusted skew information, induced from quantum Fisher information, is a well-known family of resource measures in the resource theory of asymmetry. However, its asymptotic rates are not valid asymmetry […]
Quantum 7, 1011 (2023). https://doi.org/10.22331/q-2023-05-22-1011 We introduce a classical algorithm to approximate the free energy of local, translation-invariant, one-dimensional quantum systems in the thermodynamic limit of infinite chain size. While the ground state problem (i.e., […]
Quantum 7, 1010 (2023). https://doi.org/10.22331/q-2023-05-22-1010 Communication complexity is the amount of communication needed to compute a function when the function inputs are distributed over multiple parties. In its simplest form, one-way communication complexity, Alice and […]
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