Aug 10, 2022 · 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.

Nov 22, 2020 · 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.

Feb 16, 2025 · From those articles, to read 1 qubit, we have to colapse its wave function (do I understand it right), and this qubit is fixed to 0 or 1. But then again, 1 qubit is equal to 1 bit (ordinary computer). So again, how can quantum computer be much faster? Or, perhaps to change 1 qubit status it takes much, much faster than ordinary computer clock.

Apr 4, 2025 · Quantum computers take advantage of entanglement. A single bit is in one of two states. A single qubit can be a superposition of those two states. But the magic comes when you have many entangled qubits. So 10 bits will have one of 1024 states. 10 qubits can be a superposition of any combination of those 1024 states - an enormous number.

Jan 16, 2018 · 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?

Mar 21, 2016 · I am trying to understand the following statement. "Suppose a single qubit has a state represented by the Bloch vector ##\vec{\lambda}##. Then the effect of the rotation ##R_{\hat{n}}(\theta)## on the state is to rotate it by an angle $\theta$ about the ##\hat{n}## axis of the Bloch sphere.

Sep 9, 2015 · 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.

Feb 6, 2025 · Trapping molecules to perform quantum operations. By carefully controlling how the molecules rotated with respect to one another, the team managed to entangle two molecules, creating a quantum state known as a two-qubit Bell state with 94 percent accuracy.

Sep 17, 2015 · In this abstraction, the controlled gate has no effect on the control qubit. You can even measure the control qubit before or after it is used as a control, without changing the overall expected outcome of a circuit, as long as you weren't going to do any more operations on it. However, you still get interference-destroying effects.

Feb 6, 2009 · Even simple, [itex]\mathbb{Z}_2[/itex] refers to a group, namely that of additon mod 2. It only has two elements, the identity and element a, which satisfies a^2 = 1.