25 search results - page 1 / 5 » The Complexity of Small Universal Turing Machines |
FOCS
2006
IEEE
13 years 10 months ago
2006
IEEE
We show that 2-tag systems efficiently simulate Turing machines. As a corollary we find that the small universal Turing machines of Rogozhin, Minsky and others simulate Turing ma...
CIE
2007
Springer
13 years 11 months ago
2007
Springer
STOC
1993
ACM
13 years 8 months ago
1993
ACM
In this paper we study quantum computation from a complexity theoretic viewpoint. Our first result is the existence of an efficient universal quantum Turing machine in Deutsch’s...
FCT
2009
Springer
13 years 11 months ago
2009
Springer
We give small universal Turing machines with state-symbol pairs of (6, 2), (3, 3) and (2, 4). These machines are weakly universal, which means that they have an infinitely repeate...
MCU
2007
13 years 6 months ago
2007
We present small polynomial time universal Turing machines with state-symbol pairs of (5, 5), (6, 4), (9, 3) and (18, 2). These machines simulate our new variant of tag system, the...