1 tera herz requires 1nanosecond / 1000. so light can only travel 0.0003 metres (1/3 millimetre) in that time.
Or have I got my powers of ten wrong?
Surely this will be a limitation on chip design - light is too slow for us??
Yes, the Speed of Light is a limiting factor, assuming c is in fact constant [which is currently being tested, as some results indicate this is not the case...]. The REAL limiting factor though is the space between chip components, as you start to increase latency as distances increase.