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naima
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Is there a way to write p1 |v1> + p2 |v2> if it is not a pure state but a mixture?
thanks.
thanks.
naima said:My question is about notations.
How to write correctly such a mixture?
A pure state is a quantum state that describes a system with certainty. In other words, it is a state in which all the properties of the system are known.
A pure state is a state with a single probability distribution, while a mixed state is a combination of multiple pure states with different probabilities. In other words, a mixed state represents a lack of knowledge about the exact state of the system.
No, a pure state cannot be converted into a mixed state. However, a pure state can become a mixed state if it interacts with another system or if we measure only a part of the system.
We can determine if a system is in a pure state or a mixed state by performing measurements on the system. If the measurement results are always the same, the system is in a pure state. If the measurement results vary, the system is in a mixed state.
A pure state can be represented by a single photon, which has a definite polarization. A mixture can be represented by a light beam that contains a mix of photons with different polarizations. In chemistry, a pure substance such as water can be represented as a pure state, while a solution of water and salt would be considered a mixture.