Quantum 6, 793 (2022). https://doi.org/10.22331/q-2022-09-08-793 A gapped ground state of a quantum spin system has a natural length scale set by the gap. This length scale governs the decay of correlations. A common intuition is […]
Category: quantumjournal
Quantum 6, 792 (2022). https://doi.org/10.22331/q-2022-09-08-792 Security proof methods for quantum key distribution, QKD, that are based on the numerical key rate calculation problem, are powerful in principle. However, the practicality of the methods are limited […]
Quantum 6, 791 (2022). https://doi.org/10.22331/q-2022-09-01-791 We establish a strong monogamy-of-entanglement property for subspace coset states, which are uniform superpositions of vectors in a linear subspace of $mathbb{F}_2^n$ to which has been applied a quantum one-time […]
Quantum 6, 790 (2022). https://doi.org/10.22331/q-2022-09-01-790 We consider random translation-invariant frustration-free quantum spin Hamiltonians on $mathbb Z^D$ in which the nearest-neighbor interaction in every direction is randomly sampled and then distributed across the lattice. Our main […]
Quantum 6, 789 (2022). https://doi.org/10.22331/q-2022-09-01-789 We present classical and quantum algorithms for approximating partition functions of classical Hamiltonians at a given temperature. Our work has two main contributions: first, we modify the classical algorithm of […]
Quantum 6, 788 (2022). https://doi.org/10.22331/q-2022-08-25-788 The capacity of distant parties to send signals to one another is a fundamental requirement in many information-processing tasks. Such ability is determined by the causal structure connecting the parties, […]
Quantum 6, 787 (2022). https://doi.org/10.22331/q-2022-08-24-787 The Andreev-Bashkin effect, or superfluid drag, is predicted in a system of Bose-condensed excitonic polaritons in optical microcavity coupled by electron-exciton interaction with a superconducting layer. Two possible setups with […]
Quantum 6, 786 (2022). https://doi.org/10.22331/q-2022-08-24-786 Topological quantum computations are built on a foundation of two basic tasks: preserving logical observables through time and moving logical observables through space. Memory experiments, which check how well logical […]
Quantum 6, 785 (2022). https://doi.org/10.22331/q-2022-08-24-785 The notorious quantum measurement problem brings out the difficulty to reconcile two quantum postulates: the unitary evolution of closed quantum systems and the wave-function collapse after a measurement. This problematics […]
Quantum 6, 784 (2022). https://doi.org/10.22331/q-2022-08-23-784 Recently, Renes proposed a quantum algorithm called belief propagation with quantum messages (BPQM) for decoding classical data encoded using a binary linear code with tree Tanner graph that is transmitted […]
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