Recent content by Cthugha

That sounds like you are working on the KATRIN measurement for precisely measuring Neutrino masses via tritium beta decay. I am a semiconductor (Rydberg) physics guy, but one person from our astroparticle physics department who has ties to people working at KATRIN once asked me about Rydberg...

Unfortunately, there are several different meanings of "coherent light" and one needs to consider the statement by Hanbury Brown in the context of his famous experiment. There is second-order coherence, which is about correlations in photon detections. Here, coherent light will indeed show no...

When discussing whether something is a quantum Cheshire cat, it might be helpful to have a look at Aharonov's original paper introducing the term and the experimental setup: https://iopscience.iop.org/article/10.1088/1367-2630/15/11/113015 This is New J. Phys. 15 113015 (2013). It is an open...

Just to add to the fully correct statement by Dr Transport: The angular momentum properties of the bands mostly originate from the states these bands originate from. For most materials with Zincblende structure (which includes the typical direct gap semiconductors such as GaAs and so on), the...

They work reasonably well as soon as coherence is lost, but not while the coherence is fully there. Whenever any of the atoms undergoes an interaction, it will be put in either the ground or the excited state and the Rabi oscillation will start again from this state. When there are many atoms...

A two-level system does not really have a population of excited atoms because it is typically just one atom. But the probability to find it in the excited state will initially oscillate. In the teachspin figure, it is the other way round compared to your description. First, there are...

Optical pumping is a more general term. If you have a look at the definition of the Rabi frequency in optical systems, you will find that it includes the product of the electric dipole moment of the atom and the electric field used to drive it. So the field strength changes the Rabi frequency...

No, sorry. I have no time or energy to join that game. I read your posts for some months now and there are repeating patterns. No, the 2011 PBR paper does not say that. You are misrepresenting it badly. The PBR paper says that "any model in which a quantum state represents mere information...

Just to be clear: The most famous proponent of @vanhees71 version is Zeilinger himself: https://arxiv.org/ftp/arxiv/papers/1203/1203.4834.pdf As he states on page 6: "If one views the quantum state as areal physical object, one could get the seemingly paradoxical situation that future actions...

Well, that is a quantum memory inside the trapped ion architecture. They store ion-photon entanglement. This is of course interesting for ion-trap-based networks, but due to the bandwidth problem, this is unfortunately not really applicable to standard "vanilla" SPDC photons. You would have to...

140 ms is already incredibly long. In the optical domain, this is the time range where people hope to go to in some undefined future with quantum memories. I did not follow the literature too closely. About 10 years ago, a storage time of 6 ms was considered groundbreaking and worthy of a...

That article was published in the Journal of Quantum Information SCience which is published by SCIRP. SCIRP was on Beall's list of predatory publishers (https://web.archive.org/web/20170103170850/https://scholarlyoa.com/publishers/) and is generally known to publish articles of questionable...

You did not specify what "identical" means exactly in your case. If different states of the same atom are allowed then: yes - it is possible to have an interaction with more than one local minimum. This is how Rydberg molecules are formed: See, e.g., this paper on Ultracold Rydberg molecules by...

No, when you do the math from scratch using negative permeability, you find that the direction of the flow of energy associated with the Poynting vector is directly opposite to the direction of wave propagation (which is associated with k). Therefore, using the definitions and coordinate systems...

Hossenfelder's explanation seems correct to me (at least at the popular science level). I do not exactly understand what you mean by "the same sensor". If you intend to replace them by just one large detector that clicks if either D3 or D4 are hit, then this is not equivalent to which-slit...