W state vs qubit
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W state
In quantum information science, a W state is a specific type of multipartite entangled quantum state involving three or more qubits. For three qubits, it is defined as a superposition where exactly one qubit is in the excited state while the others are in the ground state. The W state is highly notable because it retains bipartite entanglement even if one of its particles is measured or lost to th...
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qubit
The basic unit of quantum information, a qubit is a system with two distinguishable basis states conventionally labeled 0 and 1. Unlike a classical bit, its state can be a superposition of those basis states, described by complex amplitudes. These amplitudes determine measurement probabilities, while their relative phase matters when quantum operations cause different contributions to interfere....
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