量子通訊與量子自動控制Quantum Communication/Quantum Control

丁致良崇右企專

http://www.chez.com/jltingJlting@chez.com

Stochastic Resonance for Quantum Channels

Stochastic Resonance for Quantum Channels, Phys. Rev. E 59 2801-2803 (1999).

Noise Effects for the Depolarizing Channel, Phys. Lett. A 259 349-354 (1999).

Synergy of Modern Sciences

StochasticResonance

InformationTheories

QuantumComputers

Information Theory

Shannon’s theories

•網路是無線寬廣的 寬頻上網 最寬到底能多寬 ?

•WinZip 壓縮檔案能壓多小 ?

What is Stochastic Resonance?

Quantum Computers 1995 P.Shore

•科學月刊 27 卷 6 期•1998 年 李國鼎文教基金會通俗科學寫作獎•長榮月刊 2000 年 9 月轉載 •教育部高中生加油站 http://content.edu.tw 盜用

Schrödinger’s Cat

0

1

1|0||

一石二鳥

•Is there stochastic resonance for quantum channels?

•How could we have larger capacity for a quantum channel?

Channel

Mutual Information in the classical Limit is

Channel Capacity

Call for Participation:

• Teleportation Channels by P.Shore

• New Definitions for Capacities

Quantum Feedback Control without Measurement

measurement

Traditional Method for

Feedback Control

Non-Cloning Theorem

• Quantum States CANNOT be Cloned

Cloner:

V. Buzek and M. Hillery, Phys. Rev. A, 54, 1844 (1996).

N.J.Cerf, Phys. Rev. Lett., 84, 4497 (2000).

L.M.Duan and G. C. Guo, Phys. Rev. Lett., 80, 4999 (1998).

The Method I Proposed for

Quantum Control

Example:2-Level Atoms Sponteneous Decay