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Directional ballistic transport in the two-dimensional metal PdCoO<sub>2</sub>

Nature Physics - Δευ, 09/05/2022 - 00:00

Nature Physics, Published online: 09 May 2022; doi:10.1038/s41567-022-01570-7

Electrons in PdCoO2 can travel a long way before being scattered, and their band structure is such that they can travel in only one of three directions. As a result, the current flow through this nanoscale conductor can be very efficient.

Gap solitons in a one-dimensional driven-dissipative topological lattice

Nature Physics - Δευ, 09/05/2022 - 00:00

Nature Physics, Published online: 09 May 2022; doi:10.1038/s41567-022-01599-8

Drive engineering in optical systems can be used to stabilize new nonlinear phases in topological systems. Dissipatively stabilized gap solitons in a polariton lattice establish drive engineering as a resource for nonlinear topological photonics.

High-fidelity three-qubit <i>i</i>Toffoli gate for fixed-frequency superconducting qubits

Nature Physics - Δευ, 02/05/2022 - 00:00

Nature Physics, Published online: 02 May 2022; doi:10.1038/s41567-022-01590-3

The efficiency of running quantum algorithms can be improved by expanding the hardware operations that a quantum computer can perform. A high-fidelity three-qubit iToffoli gate has now been demonstrated using superconducting qubits.

Where we are with quantum

Nature Physics - Πέμ, 28/04/2022 - 00:00

Nature Physics, Published online: 28 April 2022; doi:10.1038/s41567-022-01597-w

A theoretical analysis shows how a person’s location in space could be verified by the transmission of single photons. A vital application of quantum networks may be within reach.

Thermodynamic equilibrium of optical waves

Nature Physics - Πέμ, 28/04/2022 - 00:00

Nature Physics, Published online: 28 April 2022; doi:10.1038/s41567-022-01607-x

Thermodynamic concepts can be used to understand nonlinear wave systems, but direct evidence for these analogies is scarce. Experiments with multimode fibres have now enabled direct measurement of the thermalization process of optical waves.

A single-qubit position verification protocol that is secure against multi-qubit attacks

Nature Physics - Πέμ, 28/04/2022 - 00:00

Nature Physics, Published online: 28 April 2022; doi:10.1038/s41567-022-01577-0

Unless you are nearby, it is difficult to verify where someone is. Access to a single qubit and classical computation and communication makes it possible to securely check someone’s position as long as adversaries’ quantum resources are limited.

Direct observations of thermalization to a Rayleigh–Jeans distribution in multimode optical fibres

Nature Physics - Πέμ, 28/04/2022 - 00:00

Nature Physics, Published online: 28 April 2022; doi:10.1038/s41567-022-01579-y

Optical nonlinearities in multimodal systems lead to a complex behaviour that can be described as a thermalization process, which is expected to lead to a Rayleigh–Jeans distribution. This process has now been observed in graded-index fibres.

Correlated Hofstadter spectrum and flavour phase diagram in magic-angle twisted bilayer graphene

Nature Physics - Δευ, 25/04/2022 - 00:00

Nature Physics, Published online: 25 April 2022; doi:10.1038/s41567-022-01589-w

In graphene, the spin and valley degrees of freedom combine into a higher-order isospin. Now, a full map of the phase diagram of this isospin is measured in the moiré bands of twisted bilayer graphene.

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Πανεπιστήμιο Κρήτης - Τμήμα Φυσικής - Πανεπιστημιούπολη Βουτών - TK 70013 Βασιλικά Βουτών, Ελλάδα
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