Uncertainty Product for Angular Momentum Components
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In quantum physics the (orbital- or spin-) angular momentum components , , and are represented by noncommutating Hermitian operators. Therefore, no quantum state exists with the property that two of the uncertainties , , vanish simultaneously.
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Contributed by: Reinhard Tiebel (April 2011)
Open content licensed under CC BY-NC-SA
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The general uncertainty relation for any noncommutating operators , reads , where is the expectation value of the commutator . In the special case of angular momentum operators , we obtain . In the common basis of , eigenstates, the desired uncertainty product can be calculated exactly: and plotted in the diagram.
References
[1] L. D. Landau and E. M. Lifschitz, Quantum Mechanics, Reading MA: Addison–Wesley Publishing Company, 1958.
[2] J. J. Sakurai, Modern Quantum Mechanics, Reading MA: Addison–Wesley Publishing Company, 1995.
[3] P. Reineker, M. Schulz, and B. M. Schulz, Theoretische Physik III: Quantenmechanik 1, Berlin: Wiley–VCH, 2007.
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