Quantum 5, 608 (2021). https://doi.org/10.22331/q-2021-12-23-608 We study the problem of transmitting classical information using quantum Gaussian states on a family of phase-noise channels with a finite decoherence time, such that the phase-reference is lost after […]
Quantum 5, 607 (2021). https://doi.org/10.22331/q-2021-12-23-607 Quantum dot-based quantum computation employs extensively the exchange interaction between nearby electronic spins in order to manipulate and couple different qubits. The exchange interaction, however, couples the qubit states to […]
Quantum 5, 606 (2021). https://doi.org/10.22331/q-2021-12-20-606 In this work we improve the runtime of recent classical algorithms for strong simulation of quantum circuits composed of Clifford and T gates. The improvement is obtained by establishing a […]
Quantum 5, 605 (2021). https://doi.org/10.22331/q-2021-12-20-605 Recently, Hastings & Haah introduced a quantum memory defined on the honeycomb lattice. Remarkably, this honeycomb code assembles weight-six parity checks using only two-local measurements. The sparse connectivity and two-local […]
Quantum 5, 604 (2021). https://doi.org/10.22331/q-2021-12-16-604 We define two dual tensor network representations of the (3+1)d toric code ground state subspace. These two representations, which are obtained by initially imposing either family of stabilizer constraints, are […]
Quantum 5, 603 (2021). https://doi.org/10.22331/q-2021-12-16-603 Cryptography with quantum states exhibits a number of surprising and counterintuitive features. In a 2002 work, Barnum et al. argue that these features imply that digital signatures for quantum states […]
Quantum 5, 602 (2021). https://doi.org/10.22331/q-2021-12-07-602 The decoy-state method in quantum key distribution (QKD) is a popular technique to approximately achieve the performance of ideal single-photon sources by means of simpler and practical laser sources. In […]
Quantum 5, 601 (2021). https://doi.org/10.22331/q-2021-12-07-601 Topology in general but also topological objects such as monopoles are a central concept in physics. They are prime examples for the intriguing physics of gauge theories and topological states […]
Quantum 5, 600 (2021). https://doi.org/10.22331/q-2021-12-07-600 Completely positive and trace-preserving maps characterize physically implementable quantum operations. On the other hand, general linear maps, such as positive but not completely positive maps, which can not be physically […]
Quantum 5, 599 (2021). https://doi.org/10.22331/q-2021-12-06-599 Incompatible observables underlie pillars of quantum physics such as contextuality and entanglement. The Heisenberg uncertainty principle is a fundamental limitation on the measurement of the product of incompatible observables, a […]
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