Quantum mechanics of time travel through post-selected teleportation

被引：69

作者：

Lloyd, Seth ^{[1
]}

Maccone, Lorenzo ^{[1
,2
]}

Garcia-Patron, Raul ^{[1
]}

Giovannetti, Vittorio ^{[3
,4
]}

Shikano, Yutaka ^{[1
,5
]}

机构：

[1] MIT, xQIT, Cambridge, MA 02139 USA

[2] Univ Pavia, INFN Sez Pavia, I-27100 Pavia, Italy

[3] Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy

[4] Ist Nanosci CNR, I-56126 Pisa, Italy

[5] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

来源：

PHYSICAL REVIEW D | 2011年 / 84卷 / 02期

关键词：

COSMIC STRINGS; CAUCHY-PROBLEM; FIELD THEORY; SPACETIMES; UNITARITY; CURVES; ENTANGLEMENT;

D O I：

10.1103/PhysRevD.84.025007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This paper discusses the quantum mechanics of closed-timelike curves (CTCs) and of other potential methods for time travel. We analyze a specific proposal for such quantum time travel, the quantum description of CTCs based on post-selected teleportation (P-CTCs). We compare the theory of P-CTCs to previously proposed quantum theories of time travel: the theory is inequivalent to Deutsch's theory of CTCs, but it is consistent with path-integral approaches (which are the best suited for analyzing quantum-field theory in curved space-time). We derive the dynamical equations that a chronology-respecting system interacting with a CTC will experience. We discuss the possibility of time travel in the absence of general-relativistic closed-timelike curves, and investigate the implications of P-CTCs for enhancing the power of computation.

引用

页数：11

共 66 条

[1] Quantum computing, postselection, and probabilistic polynomial-time [J].