[en] The search for new physics beyond the Standard Model in the quark sector involves direct searches for new particles (e.g. squarks), indirect searches for new amplitudes in loop processes by testing Standard Model predictions for rare decay branching fractions and decay distributions, and overconstrained tests of CKM matrix. The next generation asymmetric B Factory requires a significant increase in luminosity, approaching 10³⁶ cm^-2s^-1, well beyond the performance of PEP-II and KEKB. Such luminosity is feasible. Initial parameters of SuperPEP-II, a very high luminosity asymmetric B Factory are being developed, incorporating several new ideas from the successful operation of the present generation accelerators. Doing a precision experiment requires an upgraded detector to cope with backgrounds and radiation levels. Studies at Snowmass indicate that this is tractable. There appears to be a feasible upgrade path from the existing BABAR detector. The existing 1.5 T superconducting solenoid and flux return would be retained, as well as the instrumented flux return detectors, which will be upgraded in several years. The electromagnetic calorimeter would be based on scintillation light from liquid xenon. The vertex measurement and tracking would be done by a combination of two pixel detector layers and approximately seven double-sided strip layers. The DIRC particle identification system would be rebuilt to reduce background. R and D efforts on liquid xenon scintillation calorimetry and on a new readout scheme for the DIRC are underway. The measurement precision on CP-violating quantities assumes detector performance comparable to that currently obtained at BABAR or Belle. With new technology, it is not only possible to cope with the increased rates and backgrounds but also to improve performance in specific areas that can further improve the quality of several important measurements. The program has many unique aspects and is complementary to the programs at hadronic machines. The details of machine and detector design are far from mature, but appear to present reasonable challenges. (S. Funahashi)