- Conference date: 19–24 August 2008
- Location: Calgary (Canada)
Under the operational restriction of the U(1)‐superselection rule, states that contain coherences between eigenstates of particle number constitute a resource. Such resources can be used to facilitate operations upon systems that otherwise cannot be performed. However, the process of doing this consumes reference resources. We show this explicitly for an example of a unitary operation that is forbidden by the U(1)‐superselection rule.
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