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Quantum repeater and system and method for creating extended entanglements

A repeater, quantum technology used in the creation of extended entanglement fields that can solve problems such as increasing endpoint separation

Inactive Publication Date: 2012-07-11
HEWLETT PACKARD DEV CO LP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is generally impossible to replicate the quantum state, the separation of endpoints cannot be increased by using repeaters in the classical sense

Method used

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  • Quantum repeater and system and method for creating extended entanglements
  • Quantum repeater and system and method for creating extended entanglements
  • Quantum repeater and system and method for creating extended entanglements

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Embodiment Construction

[0036] Basic entanglement creation and extension operations

[0037] The entanglement operation ( Figure 1A )

[0038] Figure 1 schematically illustrates a known process for entanglement of two qubits qb1, qb2 (labeled 1) to create a Bell pair (referred to herein as an "entanglement operation"), which shows Snapshots (a) to (g) of a time series taken during the process. As in the present case, where at qubit qb1 , qb2 are separated by a distance greater than a few millimeters, the creation of Bell pairs is conveyed by photons, which can be sent through free space or through waveguides such as optical fibers 4 . Very generally, Bell pair creation processes can be divided into those using very small amounts of light (single photons, photon pairs, or laser pulses of very few photons) and those using pulses of many photons from a coherent source such as a laser. As will be appreciated by those skilled in the art, the details of the method of generating photons, performing the...

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Abstract

A method is provided of creating an end-to-end entanglement (89) between qubits in first and second end nodes (8 IL, 8 IR) of a chain of optically-coupled nodes whose intermediate nodes (80) are quantum repeaters. Local entanglements (85) are created between qubits in neighbouring pairs in the chain through interaction of the qubits with light fields transmitted between the nodes. A trigger (82) propagated along the chain from one end node (81L), sequentially enables each quantum repeater (100; 210) to effect a top-level cycle of operation. In each such cycle, a repeater (80) initiates a merging of two entanglements involving respective repeater qubits that are at least expected to be entangled with qubits in nodes disposed in opposite directions along the chain from the repeater. A quantum repeater (80) adapted for implementing this method is also provided.

Description

technical field [0001] The present invention relates to quantum repeaters and systems and methods for creating extended entanglement. Background technique [0002] In a quantum information system, information is maintained in the "state" of the quantum system; generally this will be a two-level quantum system that provides units of quantum information called quantum bits or "qubits". Unlike discrete classical digital states, a qubit is not limited to discrete states, but can be in a superposition of two states at any given time. [0003] Any two-level quantum system can be used for a qubit, and several physical realizations have been realized, including those based on single photons, polarization states of electron spins, nuclear spins, and coherent states of light. [0004] Quantum network connections provide communication of quantum information between remote endpoints. Potential uses of such connections include networking of quantum computers as well as "quantum key dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08G09C1/00G06N99/00H04B10/29
CPCB82Y10/00H04L9/0855G06N99/002G06N10/00H04L9/0852H04B10/70H04B10/90H04L9/08H04L9/12G09C1/00
Inventor K·A·哈里森W·蒙罗K·根本
Owner HEWLETT PACKARD DEV CO LP
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