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 […]
Category: quantumjournal
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 […]
Quantum 5, 446 (2021). https://doi.org/10.22331/q-2021-04-28-446 We consider the estimation of a Hamiltonian parameter of a set of highly photosensitive samples, which are damaged after a few photons $N_{rm abs}$ are absorbed, for a total time […]
Quantum 5, 445 (2021). https://doi.org/10.22331/q-2021-04-28-445 A reconstruction of quantum theory refers to both a mathematical and a conceptual paradigm that allows one to derive the usual formulation of quantum theory from a set of primitive […]
Quantum 5, 444 (2021). https://doi.org/10.22331/q-2021-04-26-444 Device-independent quantum key distribution aims at providing security guarantees even when using largely uncharacterised devices. In the simplest scenario, these guarantees are derived from the CHSH score, which is a […]
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