Comparing energy difference and fidelity of quantum states |
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Authors: | Victor V Dodonov |
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Institution: | 1.Instituto de Física,Universidade de Brasília Caixa Postal 04455,Brasília,Brazil |
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Abstract: | We look for upper bounds of the relative energy difference of two pure quantum states with a fixed fidelity between them or
upper bounds of the fidelity for a fixed relative energy difference. The results depend on the concrete families of states
chosen for the comparison. Exact analytical expressions are found for several popular sets of states: coherent, squeezed vacuum,
binomial, negative binomial, and coherent phase states. Their consequence is that to guarantee, for example, a relative energy
difference less than 10% for quite arbitrary (unknown) coherent states, the fidelity must exceed the level 0.995. For other kinds of states, the restrictions can be much stronger. |
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