Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:0902.2743

Quantum multiplexing with optical coherent states

Juan Carlos García-Escartín, Pedro Chamorro‐Posada

Published Feb 16, 2009• 0 citations
arXivHTMLPDF

Abstract

In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques.

DOI
10.48550/arxiv.0902.2743

Related papers

Quantum multiplexing with optical coherent states

Juan Carlos García-Escartín, Pedro Chamorro‐Posada

In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques.

Quantum Information and Computation•Jul 1, 2009•1 citation

Quantum multiplexing with optical coherent states

Juan Carlos García-Escartín, Pedro Chamorro‐Posada

In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques. 1

Quantum Information and Computation•Jul 1, 2009•4 citations

Quantum Multiplexing for Quantum Computer Networks

Juan Carlos García-Escartín, Pedro Chamorro‐Posada

In communication networks many different channels must share a limited amount of resources. In order to allow for multiple simultaneous communications, multiple access techniques are routinely employed. With quantum communication, it is possible to share a new kind of resource. All of the system channels can be accommodated into a single channel in a larger Hilbert space. In the scheme, a single line combines the information of all the users, and, at the receiver, the original quantum channels are recovered. The given multiplexer/demultiplexer circuit can perform this n qubits to qudit transformation. Connections with superdense coding and classical multiple access schemes are discussed.

arXiv:quant-ph/0701145•Jan 22, 2007•4 citations

Quantum Spread Spectrum Multiple Access

Juan Carlos García-Escartín, Pedro Chamorro‐Posada

We describe a quantum multiple access scheme that can take separate single photon channels and combine them in the same path. We propose an add-drop multiplexer that can insert or extract a single photon into an optical fiber carrying the qubits of all the other users. The system follows the principle of code division multiple access, a spread spectrum technique widely used in cellular networks.

arXiv:1401.1756•IEEE Journal of Selected Topics in Quantum Electronics•Sep 25, 2014•10 citations

Quantum Multiplexing

William J. Munro

Multiplexing is an extremely well-established technique in the telecommunication industry [1] allowing multiple independent massages generated by multiple users to share a common transmission line. It works by the multiplexer dividing the capacity of the communication channel into a number of ‘logical’ channels which allow each of the users signal to be transmitted before a demultiplexer extracts them. There are various forms of it including space-division, frequency-division, time-division, code-division multiplexing to mention a few. Recently new form of ‘telecommunication’ has arisen. The principle of quantum mechanics and their associated quantum technologies [2] allow new forms of communication governed by superposition/entanglement and it is an open question as to where multiplexing will fit into it. Further those quantum principles may allow new forms of multiplexing unavailable to the classical world.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 21, 2021•0 citations

Quantum multiplexing with the orbital angular momentum of light

Juan Carlos García-Escartín, Pedro Chamorro‐Posada

The orbital angular momentum (OAM) of photons offers a suitable support to carry the quantum data of multiple users. We present two optical setups that send the information of $n$ quantum communication parties through the same free-space optical link. Those qubits can be sent simultaneously and share path, wavelength, and polarization without interference, increasing the communication capacity of the system. The first solution, a qubit combiner, merges $n$ channels into the same link, which transmits $n$ independent photons. The second solution, the OAM multiplexer, uses controlled-not ($\mathrm{CNOT}$) gates to transfer the information of $n$ optical channels to a single photon. Additional applications of the multiplexer circuits, such as quantum arithmetic, as well as connections to OAM sorting are discussed.

arXiv:0901.4740•Physical Review A•Dec 11, 2008•50 citations
In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques.
In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques.
In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques. 1
In communication networks many different channels must share a limited amount of resources. In order to allow for multiple simultaneous communications, multiple access techniques are routinely employed. With quantum communication, it is possible to share a new kind of resource. All of the system channels can be accommodated into a single channel in a larger Hilbert space. In the scheme, a single line combines the information of all the users, and, at the receiver, the original quantum channels are recovered. The given multiplexer/demultiplexer circuit can perform this n qubits to qudit transformation. Connections with superdense coding and classical multiple access schemes are discussed.
Multiplexing is an extremely well-established technique in the telecommunication industry [1] allowing multiple independent massages generated by multiple users to share a common transmission line. It works by the multiplexer dividing the capacity of the communication channel into a number of ‘logical’ channels which allow each of the users signal to be transmitted before a demultiplexer extracts them. There are various forms of it including space-division, frequency-division, time-division, code-division multiplexing to mention a few. Recently new form of ‘telecommunication’ has arisen. The principle of quantum mechanics and their associated quantum technologies [2] allow new forms of communication governed by superposition/entanglement and it is an open question as to where multiplexing will fit into it. Further those quantum principles may allow new forms of multiplexing unavailable to the classical world.
The orbital angular momentum (OAM) of photons offers a suitable support to carry the quantum data of multiple users. We present two optical setups that send the information of nnn quantum communication parties through the same free-space optical link. Those qubits can be sent simultaneously and share path, wavelength, and polarization without interference, increasing the communication capacity of the system. The first solution, a qubit combiner, merges nnn channels into the same link, which transmits nnn independent photons. The second solution, the OAM multiplexer, uses controlled-not (CNOT\mathrm{CNOT}CNOT) gates to transfer the information of nnn optical channels to a single photon. Additional applications of the multiplexer circuits, such as quantum arithmetic, as well as connections to OAM sorting are discussed.