Back to Publications List       Conservation laws, uncertainty relations, and quantum limits of measurements M. Ozawa Physical Review Letters 88 (5): art. no. 050402 February 4 2002 Abstract The uncertainty relation between the noise operator and the conserved quantity leads to a bound on the accuracy of general measurements. The bound extends the, assertion by Wigner, Araki, and Yanase that conservation laws limit the accuracy of "repeatable," or "nondisturbing," measurements to general measurements, and improves the one previously obtained by Yanase for spin measurements. The bound represents an obstacle to making a small quantum computer.         Home | About the Program | Our Research | Publications | People Related MURIs | Contact © Massachusetts Institute of Technology