Quantum 5, 455 (2021). https://doi.org/10.22331/q-2021-05-10-455 A number of physically intuitive results for the calculation of multi-time correlations in phase-space representations of quantum mechanics are obtained. They relate time-dependent stochastic samples to multi-time observables, and rely […]
Increasingly, modern life depends on how skillfully we shuttle electrons through the nanoscale mazes etched on computer chips. These processors aren’t just for laptops anymore—they’re used in your car, your thermostat, your refrigerator and microwave. […]
Quantum 5, 454 (2021). https://doi.org/10.22331/q-2021-05-04-454 We propose and analyze a set of variational quantum algorithms for solving quadratic unconstrained binary optimization problems where a problem consisting of $n_c$ classical variables can be implemented on $mathcal […]
Quantum 5, 453 (2021). https://doi.org/10.22331/q-2021-05-04-453 It is well known that a quantum circuit on $N$ qubits composed of Clifford gates with the addition of $k$ non Clifford gates can be simulated on a classical computer […]
Quantum 5, 452 (2021). https://doi.org/10.22331/q-2021-05-04-452 Photon loss is destructive to the performance of quantum photonic devices and therefore suppressing the effects of photon loss is paramount to photonic quantum technologies. We present two schemes to […]
Quantum 5, 451 (2021). https://doi.org/10.22331/q-2021-05-01-451 Master equations are a vital tool to model heat flow through nanoscale thermodynamic systems. Most practical devices are made up of interacting sub-system, and are often modelled using either $textit{local}$ […]
Quantum 5, 450 (2021). https://doi.org/10.22331/q-2021-05-01-450 One of the key ingredients of many LOCC protocols in quantum information is a multiparticle (locally) maximally entangled quantum state, aka a critical state, that possesses local symmetries. We show […]
Quantum 5, 449 (2021). https://doi.org/10.22331/q-2021-05-01-449 Squeezed state in harmonic systems can be generated through a variety of techniques, including varying the oscillator frequency or using nonlinear two-photon Raman interaction. We focus on these two techniques […]
Quantum 5, 448 (2021). https://doi.org/10.22331/q-2021-05-01-448 We identify necessary and sufficient conditions for a quantum channel to be optimal for any convex optimization problem in which the optimization is taken over the set of all quantum […]
Quantum 5, 447 (2021). https://doi.org/10.22331/q-2021-04-28-447 Quantum data locking is a quantum phenomenon that allows us to encrypt a long message with a small secret key with information-theoretic security. This is in sharp contrast with classical […]
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