I'm having a little bit of trouble getting my head around the idea of the reduced density operator being used to tell us about the entanglement of a state.(adsbygoogle = window.adsbygoogle || []).push({});

I understand that if you take the reduced density operator of any of the Bell states, you get a reduced density operator proportional to the identity, and this is defined as being a maximally entangled state.

But why is this a proof that the state is entangled?

I have written problem that asks to solve the reduced density operator for a particular state. I solve for the reduced density operator and I get a 2x2 matrix with elements in each slot. It satisfies the conditions to be a density operator, but what does it tell me about the entanglement of the state?

Any clarification would be much appreciated!

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# A Reduced Density Operator and Entanglement

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