In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
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Topological entanglement entropy is a useful measure to detect topologically ordered states. Recent progress has shown that there are different kinds of topological states called symmetry protected topological (SPT) phases. Despite that they show some topological properties such as gapless edge modes, they have no topological order and the topological entanglement entropy simply vanishes as in the case of trivial phases.
Therefore, the topological entanglement entropy cannot distinguish SPT phases from trivial phases. In this talk, I will introduce a new quantum measure, a grand canonical entanglement entropy, and show that it gives a topological invariant which distinguishes SPT phases from trivial phases. If time permits, I will also explain an edge theory approach to compute mutual information and entanglement negativity in Chern-Simons theories.