  We propose the piecemeal quantum telescope through bit-by-bit iteration using
different baselines. It improves precision exponentially with number of
baselines, and it works robustly under large observation errors such as
statistical errors, channel noise, operational errors and so on. For example,
under the noisy channel of random phase drifts, our method can provide an
exponential precision provided that the detected data is not entirely noisy.
Being fault tolerant to statistical error, it requests only a small number of
incident single-photons in detecting the star angle with exponential precision.
As a result, it requests to detect only a few hundreds of photons from the
target star for a precision breaking classical limit by 4 to 5 magnitude
orders. This demonstrates a super efficiency.
