How to Detect the Gravity-induced Phase Shift in Labs?

The measurements of time and frequency are very accurate with modern technology. By use of them we can measure the gravitational constant very accurately. First we derive from the higher dimensions a formula for the gravity-induced phase shift around a circuit loop, which amounts to an order of 10(-6) rad. Then we propose experiments in labs to detect this phase shift by using the high-T-c d-wave Josephson junction which is included in a cuprate superconductor circuit loop. By rotating the loop round the horizontal axis, the gravity-induced phase shift can be detected as a frequency shift which can be measured very accurately.