Adaptive quantum information processing

Patent metadata

Field	Value
Publication number	US-9838141-B2
Application number	US-201314027942-A
Country	US
Kind code	B2
Filing date	Sep 16, 2013
Priority date	Sep 14, 2012
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A method and system for adaptive quantum information processing can be provided by determining a state of a quantum channel governing an environment with a tomography module. Next a scope of the quantum channel can be calculated with a scope algorithm module. Finally, an optimization module can be utilized to optimize the way to quantum mechanically represent information to be transmitted through the quantum channel based on the scope.

First claim

The invention claimed is:

1. A method for configuring a device that communicates through a quantum channel governing a physical environment, the method comprising:
determining a mathematical model describing the quantum channel;
determining, based on the determined mathematical model of the quantum channel, a scope of the quantum channel;
determining, using a processor, an eigenvector corresponding to a largest value of the scope;
configuring the device to engage in quantum key distribution (QKD) with a satellite through the quantum channel by using a private key to transmit information about the eigenvector; and
engaging in QKD with the satellite through the quantum channel, using the configured device, based on the determined eigenvector and a degree of rotation of the eigenvector.

2. The method of claim 1 , wherein determining the scope of the quantum channel comprises determining the scope based on an equation:

s
⁡

(
f
)

=

[

(

1
+

sgn
⁡

(

λ
1

⁢

λ
3

)

)

2

⁢

(

1
-

H
⁡

(

1
+

min
⁢



λ
i



2

)

)

,

1
-

H
⁡

(

1
+

max
⁢



λ
i



2

)

]

,

wherein s(f) represents the scope of a symmetric unital channel f, wherein symmetric unital channel f has eigenvalues λ1≦λ2≦λ3, and wherein H represents entropy for the quantum channel.

3. The method of claim 1 , further comprising utilizing the largest value of the scope to maximize an amount of information transmitted through the quantum channel.

4. The method of claim 1 , further comprising utilizing a smallest scope value to measure a performance of a method designed to interrupt a communication through the quantum channel.

5. The method of claim 1 , wherein configuring the device to engage in QKD through the quantum channel using the eigenvector enables the device to communicate faster through the quantum channel.

6. A system for communicating through a quantum channel governing a physical environment, the system comprising:
a communication device configured to communicate through the quantum channel;
a tomography module configured to determine a mathematical model describing the quantum channel;
a scope algorithm module configured to determine, based on the determined mathematical model of the quantum channel, a scope of the quantum channel and an eigenvector corresponding to a largest value of the scope; and
an optimization module configured to configure the communication device to engage in quantum key distribution (QKD) with a satellite through the quantum channel by using a private key to transmit information about the eigenvector and
to engage in QKD with the satellite through the quantum channel, using the configured communication device, based on the eigenvector and a degree of rotation of the eigenvector.

7. The system of claim 6 , wherein the scope algorithm module is configured to determine the scope of the quantum channel based on an equation:

s
⁡

(
f
)

=

[

(

1
+

sgn
⁡

(

λ
1

⁢

λ
3

)

)

2

⁢

Assignees

• Martin Keye
• Us Navy

Inventors

• Martin Keye

Classifications

• H04B10/0795

  Performance monitoring; Measurement of transmission parameters · CPC title

• H04B10/70 Primary

  Photonic quantum communication · CPC title

• H04L9/0852

  Quantum cryptography (transmission systems employing electromagnetic waves other than radio waves, e.g. light, infrared H04B10/00; wavelength-division multiplex systems H04J14/02; WDM arrangements H04J14/03) · CPC title