2024年4月2日 · Anything with a 2-dim Hilbert space is a qubit " As an approximation for analyzing particular experiments, this can work ok–basically you are ignoring all the other degrees of freedom of the particular system (buckyball, silver atom in an S-G experiment, etc.) because you have set up the experiment so those degrees of freedom, to a good enough approximation, do not affect the outcome.

2022年8月10日 · A qubit is not a storage element, it is a noisy processor element that has a probability; 0 ≤ p ≤ 1. Each time you read a single qubit you will get only 0 or 1. Coupling between the qubits in a QC distorts the probabilities and may statistically lead to a valid result.

2020年11月22日 · A qubit has, theoretically, an infinite number of possible states. And, theoretically, each state could represent a different piece of data. And, just like the above, any finite amount of information could be encoded in a single qubit state.

2018年1月16日 · Hello everyone, I don't know how to measure the QBER of BB84 protocol in a realistic experiment.In the most paper show the data which is only the number but do not show the unit of data, what is the unit of these data?

2015年9月9日 · The Planck length is an extremely small distance constructed from physical constants. Many misconceptions generally overstate its physical significance, stating that it’s the inherent pixel size of the universe.

2025年2月6日 · Quantum physics, or quantum mechanics, is a branch of physics that explores the behavior of matter and energy at the smallest scales, where classical physics principles break down.

2015年10月3日 · To actually delay the choice to erase, the result needs to be stored in an unmeasured qubit (which is not a thing you can burn). And the results don't change after the fact when you choose to measure the qubit. Instead, the results stay the same but you split them into two groups based on the outcome of measuring the associated qubit.

2011年10月31日 · The most simple way to talk about phase that I can think of is in the 2 slit experiment. If we look at a point P on the screen (where the detector is), then the laws of quantum mechanics say that the amplitude (key word here is "amplitude" and not "probability) to detect a particle at that point, is the sum of the amplitudes for the …

2024年12月29日 · New avenues in quantum research: Supramolecular chemistry detects qubit candidates; An overlooked nuclear force helps keep matter stable, study reveals; Trapped-ion processor demonstrates verifiable quantum random sampling

3 天之前 · if the wave function is a mathematical description of a quantum state it can't be the quantum state of say an Elektron itself It can in some interpretations--the MWI, for example.