Give this - there's a lot more. Let's first talk about measurement and collapse -

Measurement and Collapse

Understanding the behavior of qubits and quantum systems depends heavily on our understanding of measurement and collapse, two key ideas in quantum physics. A qubit's quantum state collapses when it is measured, most likely to one of its base states (|0⟩ or |1⟩), with probabilities given by the squared magnitudes of the probability amplitudes. The probability of measuring |0⟩ is |α|^2, and the probability of measuring |1⟩ is |β|^2 if the qubit is in the state depicted above. The qubit must be in one of the base states after measurement, and it is crucial that these probabilities all total up to 1, or else there would be something wrong. It would mean not all outcomes are adequate if there is a missing probability i.e. <1 or there is too much probability for certain results, meaning the p > 1.

Projection Postulate

The Projection Postulate explains how measurements are made in quantum physics. According to the projection postulate, the quantum system is in a new state following a measurement that is the old system's normalized projection onto the kets corresponding to the measurement result. This implies that doing the same measurement twice will get identical results as if we already knew what would happen, which is what the computer is simulating. A qubit's quantum state vector collapses to the eigenstate corresponding to the result of the measurement when it is measured. To clarify, an eigenstate is a state of a quantum system, in which one of the variables defining a state has a static or fixed value. A particle might, for instance, be at a specific location like x=0. The eigenfunction of a linear operator that corresponds to an observable is the wave function of an eigenstate. When measuring the observable, a number known as the eigenvalue of the wave function is measured. Most systems are a combination of multiple eigenstates. Without getting too complicated - this equation can represent the relationship, where A is a complex number,  ψa is a corresponding eigenstate of A:
Aψa(x)=aψa(x)
Back of before, the quantum state collapses to |0⟩ if the measurement result is |0⟩. The state collapses to |1⟩ if the result is |1⟩. Depending on the result of the measurement, the qubit is in a certain state after that, either |0⟩ or |1⟩. As a result, the results of subsequent measurements on the same qubit will always be consistent. The superposition is broken when a measurement "forces" a qubit to take on a specific state. This is a vital portion of how the rest of quantum computing functions so make sure you understand it if you are looking to take something away from this article.
Implications to Entangled Qubits
(Refer to entangled qubits below)
Interesting repercussions for entangled qubits result from measurement. Even though the qubits are spatially separated, the measurement results of one entangled qubit can instantly affect the measurement results of another. The hallmark of quantum physics is a phenomenon known as quantum non-locality. Quantum entanglement is something that scientists have worked on for decades now, starting in the late 1980s, with only three or four particles of light. Now, we can entangle up to 27 qubits in modern quantum computers at the time of writing this paper(2023).

Decoherence

Quantum decoherence may have an impact on measurement results, even if measurement enables us to retrieve information from quantum systems. The measurement process may be impacted by the phenomena of quantum decoherence, which is the loss of quantum coherence brought on by interactions with the environment. Decoherence has the ability to add noise and mistakes into measurement results, which could result in errors in quantum computing. This can cause information to be lost, which is the main hindrance of this method, granted that it still is necessary for efficiency purposes.