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> Japan will compensate companies to keep secret patents with potential military applications under proposed legislation > The patents under review in the prop

by mkl95 5y ago

> Japan will compensate companies to keep secret patents with potential military applications under proposed legislation > The patents under review in the proposed economic security legislation will include technology that can help develop nuclear weapons, such as uranium enrichment and cutting-edge innovations like quantum technology, the financial daily said. It seems that they are basically asking companies to be quiet if they are making something for military use. Not sure about the quantum part.

sandworm101 5y ago
Quantum navigation. Quantum accelerometers theoretically enable hyper-accurate guidance systems immune to external jamming. https://en.wikipedia.org/wiki/Quantum_compass https://en.wikipedia.org/wiki/Quantum_compass
- _nezo 5y ago
  That sounds interesting. Iirc inertial navigation systems are also a key component in missiles that don't enable radar (and so reveal their presence) until they're right on the target ("pitbull"). I don't know how much of a limiter the INS is there, but it could possibly lead to more precise missiles with less warning time.
  - sandworm101 5y ago
    Missiles yes, but it is more practical for submarines. More accurate submarine navigation means they can navigate closer to the bottom/coast without using sonar and can fire ballistic missiles accurately without surfacing.
- cabalamat 5y ago
  > Quantum accelerometers theoretically enable hyper-accurate guidance systems immune to external jamming Can one jam normal accelerometers? I don't see how.
  - yjftsjthsd-h 5y ago
    I think it's rather that normal accelerometers aren't precise enough to replace GPS (well, radio/satellite based positioning systems), which are possible to jam.
  - naniwaduni 5y ago
    Normal guidance systems, which rely on non-accelerometer input, are vulnerable to external jamming.
    - cabalamat 5y ago
      Certainly GPS is, but I don't see how inertial or celestial are.
      - sandworm101 5y ago
        Celestisl is impractical for modern weapons. INS just isnt accurate enough over long periods (think of subs submerged for months).
        cabalamat 5y ago
        > Celestial is impractical for modern weapons. My understanding is ICBMs use it. It could be used by UAVs to get within a few miles of the target, and then use visual / IR / radar to to get to a more precise location.
resoluteteeth 5y ago
> It seems that they are basically asking companies to be quiet if they are making something for military use. Not sure about the quantum part. The US does that too, if you try to file a patent for something that has military applications. https://slate.com/technology/2018/05/the-thousands-of-secret-patents-that-the-u-s-government-refuses-to-make-public.html https://slate.com/technology/2018/05/the-thousands-of-secret... I'm not sure if the US even provides compensation like the Japanese government is going to.

by mkl95 5y ago

sandworm101 5y ago

Quantum navigation. Quantum accelerometers theoretically enable hyper-accurate guidance systems immune to external jamming. https://en.wikipedia.org/wiki/Quantum_compass https://en.wikipedia.org/wiki/Quantum_compass

_nezo 5y ago
That sounds interesting. Iirc inertial navigation systems are also a key component in missiles that don't enable radar (and so reveal their presence) until they're right on the target ("pitbull"). I don't know how much of a limiter the INS is there, but it could possibly lead to more precise missiles with less warning time.
- sandworm101 5y ago
  Missiles yes, but it is more practical for submarines. More accurate submarine navigation means they can navigate closer to the bottom/coast without using sonar and can fire ballistic missiles accurately without surfacing.
cabalamat 5y ago
> Quantum accelerometers theoretically enable hyper-accurate guidance systems immune to external jamming Can one jam normal accelerometers? I don't see how.
- yjftsjthsd-h 5y ago
  I think it's rather that normal accelerometers aren't precise enough to replace GPS (well, radio/satellite based positioning systems), which are possible to jam.
- naniwaduni 5y ago
  Normal guidance systems, which rely on non-accelerometer input, are vulnerable to external jamming.
  - cabalamat 5y ago
    Certainly GPS is, but I don't see how inertial or celestial are.
    - sandworm101 5y ago
      Celestisl is impractical for modern weapons. INS just isnt accurate enough over long periods (think of subs submerged for months).
      - cabalamat 5y ago
        > Celestial is impractical for modern weapons. My understanding is ICBMs use it. It could be used by UAVs to get within a few miles of the target, and then use visual / IR / radar to to get to a more precise location.

resoluteteeth 5y ago

> It seems that they are basically asking companies to be quiet if they are making something for military use. Not sure about the quantum part. The US does that too, if you try to file a patent for something that has military applications. https://slate.com/technology/2018/05/the-thousands-of-secret-patents-that-the-u-s-government-refuses-to-make-public.html https://slate.com/technology/2018/05/the-thousands-of-secret... I'm not sure if the US even provides compensation like the Japanese government is going to.