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.
Permanent link for public information only:
Permanent link for all public and protected information:
Quantum mechanics is supposedly universal. That is,
applicable to any physical system on which experiments can be
made. However, the kind of phenomena that have made quantum
mechanics striking, like the nonexistence of definite
noncontextual values and the need of superpositions to describe
the state of a system is supposedly relevant only for
"subatomic" or "microscopic" systems. The prevalent idea is
that, the more complex the system is, the greater the effect of
noise and decoherence, thus quantum phenomena become
unobservable beyond relatively simple systems. Here we show
that there is an inequality for the correlations between three
sequential measurements, which must be satisfied by any
description with definite noncontextual values, but is violated
by quantum mechanics for any state of any physical system of
n>1 qubits. Its remarkable feature is that the violation
predicted by quantum mechanics is such that the maximum
tolerated error in the measurements allowing a violation of the
inequality grows with n. This opens the possibility of
observing quantum contextuality in complex systems.