  3G and 4G mobile are based on CDMA technology. In order to increase the
effectiveness of CDMA receivers large amount of effort is invested to develop
suitable multi-user detector techniques. However, at this moment there are only
suboptimal solutions available because of the rather high complexity of optimal
detectors. One of the possible receiver technologies can be the quantum
assisted computing devices which allows high level parallelism in computation.
The first commercial devices are estimated by 2004, which meets the advert of
3G and 4G systems. In this paper we introduce a novel quantum computation based
Quantum Multi-user detection (QMUD) algorithm, employing simple Positive
Operation Valued Measurement (POVM), which provides optimal solution. The
proposed algorithm is robust to any kind of noise.
