Quantum computation by measurement and quantum memory
Abstract
What resources are universal for quantum computation? In the standard model of a quantum computer, a computation consists of a sequence of unitary gates acting coherently on the qubits making up the computer. This requirement for coherent unitary dynamical operations is widely believed to be the critical element of quantum computation. Here we show that a very different model involving only projective measurements and quantum memory is also universal for quantum computation. In particular, no coherent unitary dynamics are involved in the computation.
 Publication:

Physics Letters A
 Pub Date:
 February 2003
 DOI:
 10.1016/S03759601(02)018030
 arXiv:
 arXiv:quantph/0108020
 Bibcode:
 2003PhLA..308...96N
 Keywords:

 Quantum Physics
 EPrint:
 4 pages