There are 4 enabling technologies necessary to change nuclear war from MAD to achievable decisive victory:
1) Conventional ABM systems (eg, ABM missiles, ASAT systems and related projectile based systems)
2) DEW based systems (eg. particle beam cannons, lasers (of various types including x-ray/gamma ray wavelengths)
3)
(this includes orbital microwave arrays and solar laser transfer/satellite systems)
4) Nuclear Fusion technology
The first aspect is self-explanatory and of which China has the needed technical/industrial basis to exceed US levels. The second is another area that China has significant leads on in R&D and in service deployment (even if still in relative limited numbers) that can be continuously scaled up for increasing effectiveness. The third is another area that can also be scaled rather quickly with China's industrial base, as that would not only allow for major power generation anywhere in the world, it can also serve as an orbital strike capability able to destroy human sized targets at sea level anywhere globally with only 1 second of exposure time, which would also be powerful enough to destroying incoming ballistic missiles (an orbital array network scaled to the moon's diameter would be a necessary minimum to achieve such effects).
The last one is the hardest one but the most technically profound because it would not only allow for much more powerful DEW systems for surface-based ABM to be built, but also allow for stratospheric EM field generation and projection for attenuation of nuclear airbursts (meaning that even MT level airbursts would only be like a strong sunburn to people at ground level due to inverse square law effects), but again this is the most difficult one to achieve. The main things are that all 4 approaches need minimal fissile materiel to achieve while enabling strategically decisive capabilities to be performed simultaneously including continuous orbital bombardment of surface targets.