This question resolves YES for a technology that, before 2030:
is fundamentally based on quantum mechanics/ quantum entanglement
is used for transmission
isn't simply a tech for quantum cryptography or computerization that still has a conventional transmission backbone, like Quantum Key Distribution does
is "in use" in some fashion
can be very limited, private, military, etc., but cannot still be on the research floor
has some implicit practical application
works at distances of at least 10 meters between the transmitter and receiver
but it's perfectly fine for the purposes of this question if the tech would work at such distances but doesn't when lacking line-of-sight or is obstructed in some other manner, just as many conventional communications technologies do
A sci-fi example is "ansible" technology that allows for instant FTL communication over vast distances. However, to qualify for a YES resolution, a primitive real-world quantum communications technology doesn't need to be sci-fi levels of perfect. I will accept significant speed, range, and throughput limitations so long as any real-world technology still fits the basic criteria listed above.
Otherwise, this question resolves NO in 2030.
Many of these criteria were developed in collaboration with traders in the market. I'm more than open to further discussing resolution criteria, if necessary.
As I often do, I put in limit orders to help initial bettors, and might trade more on this market.