Conditional spin squeezing can be achieved by continuous quantum-nondemolition measurement of an atomic sample. We show that simultaneous feedback of the measurement results can control the quantum state such that the squeezing becomes unconditional. For very strong cavity coupling, the squeezing approaches the Heisenberg limit. Squeezing is also produced at weaker couplings and even in free space, thus presenting a simple experimental test for quantum feedback.
Spin squeezing via continuous QND feedback
MANCINI, Stefano
2003-01-01
Abstract
Conditional spin squeezing can be achieved by continuous quantum-nondemolition measurement of an atomic sample. We show that simultaneous feedback of the measurement results can control the quantum state such that the squeezing becomes unconditional. For very strong cavity coupling, the squeezing approaches the Heisenberg limit. Squeezing is also produced at weaker couplings and even in free space, thus presenting a simple experimental test for quantum feedback.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
