At 49:20 seconds, Aelita West (Charlotte Riley) quotes the poem auguries of innocence by the famous 18th century poet William Blake. Which makes sense in the context of the mentioned concept of quantum tunneling.
To see a World in a Grain of Sand
And a Heaven in a Wild Flower
Hold Infinity in the palm of your hand
And Eternity in an hour.
The London scenes include Bond Street, Trafalgar Square and St Mary Axe.