There is a growing sense in Italy that the worst may have passed. The weeks of locking down the country, center of the world’s deadliest coronavirus outbreak, may be starting to pay off, as officials announced this week that the numbers of new infections had plateaued.

That glimmer of hope has turned the conversation to the daunting challenge of when and how to reopen without setting off another cataclysmic wave of contagion. To do so, Italian health officials and some politicians have focused on an idea that might once have been relegated to the realm of dystopian novels and science fiction films.