While I don't think that QR codes have much of a future in the main visitor space, their use behind the scenes as a replacement (or compliment) to barcodes for tagging collections is possible.
They have some nice advantages over the alternatives,
- for example they have error correction which barcodes don't, makes them resilient
- they are cheaper than rfid tags
- they don't need any special hardware to read (just a camera) which makes them future proof
- they can be easily and automatically be picked out of an image, means you can scan multiple objects at once
So for visitors, nfc and low energy bluetooth might be better but if you want cheap, resilient and future proof then QR codes have to be the winner.
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