Building a quantum computer is difficult because qubits often lose coherence between themselves due to interactions with their environment. Quantum computers must also run at extremely low temperatures and use sophisticated error-correction techniques to keep qubits entangled (a phenomenon where the state of one qubit is directly related to the state of another) long enough to perform calculations. Moreover, measuring qubits to record a usable result can disturb their state, making it challenging to extract information at the right stage of the calculation without affecting the computation
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