• DOI:10.1007/BF02817189
• Corpus ID: 121145494

A general argument against superluminal transmission through the quantum mechanical measurement process

@article{Ghirardi1980AGA,
  title={A general argument against superluminal transmission through the quantum mechanical measurement process},
  author={Giancarlo Ghirardi and Alberto Rimini and Tullio Weber},
  journal={Lettere al Nuovo Cimento (1971-1985)},
  year={1980},
  volume={27},
  pages={293-298}
}

• G. Ghirardi, A. Rimini, T. Weber
• Published 1 March 1980
• Philosophy
• Lettere al Nuovo Cimento (1971-1985)

In a r ecen t pape r (1) two of us have shown t h a t some recen t resul ts (~-4) abou t t he poss ib i l i ty of t r a n s m i t t i n g super lumina l signals t h r o u g h the collapse of t he wave funct ion have been ob ta ined using incorrec t a rgument s , e i ther mak ing use of con t r ad i c to ry a s sumpt ions {3,4) or d i s regard ing the l imi ta t ions on the func t ion ing of a ha l f -wave p la te which follow f rom the a s sumed ro ta t iona l invar iance of t he t h e o r y (2). I n t he p r e s en t pape r we w a n t to po in t out t h a t no super lumina l t r ansmiss ion of signals can be ob ta ined as a consequence of the s t a n d a r d q u a n t u m thco ry of measm'ement . This fact will be shown to be t rue comple te ly in general , w i t h o u t resor t ing to t he Wigne r -Arak i -Yanase t h e o r e m (5,6) we have used in ref. (1). We s ta r t by observ ing t h a t t he above quo ted papers deal w i th a composi te q u a n t u m sys t em S -U + V for which thc t w o c o m p o n e n t subsys t ems U and V lie in largely s epa ra t ed space regions and arc non in te rac t ing . In these s epa ra t ed regions we h a v e two appa ra tuses A and B devised to pe r fo rm m e a s u r e m e n t s on U and V, respect ive ly .