An album of one-minute headcam clips climbing the Aiguilles d’Entrèves traverse (3,600m, AD-) via Glacier du Géant, Mont Blanc massif, France. Route description: theCrag. The post Aiguilles d’Entrèves traverse (3,600m) appeared first on Peter Rohde ..read more

What is a graph state? One especially useful class of quantum states is graph states, also known as cluster states. As the name suggests, a graph state |G\rangle is associated with a graph, G=(V,E), where the vertices (v\in V) represent qubits initialised into the |+\rangle = (|0\rangle+|1\rangle)/\sqrt{2} state, and edges (e\in E) represent the application of controlled-phase (CZ) gates between respective vertices, where, \mathrm{CZ}=\mathrm{diag}(1,1,1,-1). A graph state can therefore be expressed as, |G\rangle = \left[ \prod_{e\in E} \mathrm{CZ}_e \right] |+\rangle^{\otimes |V|}. Sinc ..read more

Entangling Bell measurements are an essential ingredient in many photonic quantum technologies. In optical quantum computing they are employed as fusion gates to create edges in graph states, while in quantum communications protocols they may be used to implement entanglement swapping in quantum repeater networks (entanglement distribution networks) for extending the range of entanglement links. In this post I’ll describe how this very simple optical circuit works and address some of the nuances and common misconceptions surrounding it. What is a Bell measurement? A Bell measurement is a two-q ..read more

I completely disagree with the open letter signed by Elon Musk and numerous other luminaries in which they advocate a moratorium on advancing AI so that time can be taken to consider the implications and risks associated with this technology. • While the intention is well-meaning and the risks are real, the analysis is superficial and unlikely to play out as suggested. • Although there are undeniably major risks presented by advanced AI, a moratorium is unlikely to further progress in dealing with them and more likely hinder it. Political responses to disruptive forces tend to be reactionary r ..read more

My new track “Naso del Liskamm” is now available on Spotify, SoundCloud and other major streaming services. The post New track – Naso del Liskamm appeared first on Peter Rohde ..read more

My new track “Zinalrothorn” is now available on SoundCloud. The post New track — Zinalrothorn appeared first on Peter Rohde ..read more

We’re delighted to announce that MoodSnap mood diary is now localised to the Spanish language. We’re incredibly excited that all our Spanish-speaking friends can now use MoodSnap in their native language. Thank you to Melany Nadine Monroy Icaza for providing the translation and Christian Ronald Cresci for proof-checking. www.moodsnap.app The post MoodSnap now in Spanish appeared first on Peter Rohde ..read more

One of the goals of my free mood diary app MoodSnap is to make it accessible to as many people as possible. Today I’m pleased to announce that MoodSnap has been fully localised for the German language, with more languages in progress. You can get MoodSnap on the Apple AppStore and find out more at the MoodSnap homepage. The post MoodSnap jetzt in Deutsch appeared first on Peter Rohde ..read more

What is a graph state? One especially useful class of quantum states is graph states, also known as cluster states. As the name suggests, a graph state |G\rangle is associated with a graph, G=(V,E), where the vertices (v\in V) represent qubits initialised into the |+\rangle = (|0\rangle+|1\rangle)/\sqrt{2} state, and edges (e\in E) represent the application of controlled-phase (CZ) gates between respective vertices, where, \mathrm{CZ}=\mathrm{diag}(1,1,1,-1). A graph state can therefore be expressed as, |G\rangle = \left[ \prod_{e\in E} \mathrm{CZ}_e \right] |+\rangle^{\otimes |V|}. Sinc ..read more

Our new paper on using boson-sampling as a basis for distributed blockchain consensus algorithms is available here. Abstract: Since its advent in 2011, boson-sampling has been a preferred candidate for demonstrating quantum advantage because of its simplicity and near-term requirements compared to other quantum algorithms. We propose to use a variant, called coarse-grained boson-sampling (CGBS), as a quantum Proof-of-Work (PoW) scheme for blockchain consensus. The users perform boson-sampling using input states that depend on the current block information, and commit their samples to the netwo ..read more