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

Technical Physics Letters

Waveguide Logic Gates for Magnetooptical Qubits

Shukhrat Egamov, Abduvali M. Khidirov, Kh O Urinov, Kh. A. Zhumanov

Published Oct 1, 2020• 3 citations
Publisher

Abstract

Abstract Results of studying properties of magnetooptical waveguide logic gates are presented. Simple logical operations can be implemented by changing photon states in a substance under the action of a modulating magnetic field. Varying the amplitude and orientation of the magnetic field relative to the light propagation direction, choosing the orientation of the polarizer and analyzer and appropriate configuration of the waveguide, one can design logic gates, including ones for qubit models. In doing this, the time barrier of low coherence peculiar to optical qubits is passed.

DOI
10.1134/s1063785020100041

Related papers

Волноводные логические вентили для магнитооптических кубитов

Ш.В. Эгамов, Abduvali M. Khidirov, Kh O Urinov +1 more

Results of magneto-optical waveguide logic gates properties investigation are presented. Simple logic operations can be realized using photon properties in modulated magnetic field. Changing the magnetic field amplitude and its orientation relating to light propagation direction, choosing polarizer and analyzer orientation and proper waveguide geometry, we can design logic gates avoiding small coherence time of regular optic qubits.

Письма в журнал технической физики•Jan 1, 2020•0 citations

Application of magneto-optical logic devices for cryptographic processing in optical communication systems

Abduvali M. Khidirov, Khakberdi Jumanov, J R Kilichov +2 more

This paper presents a study of magneto-optical waveguide logic gates for optical communication systems. Simple logic operations are implemented by modulating photon states in a material through applied magnetic fields. By controlling the magnetic field's amplitude and orientation relative to light propagation, selecting polarizer/analyzer alignment, and configuring waveguides, we designed logic gates including qubit-compatible models that overcome the low coherence times typical of optical qubits. Optical qubits are promising candidates for quantum information processing and data transmission. For cryptographic applications using Vernam encryption, we developed an XOR logic gate simulator based on magneto-optical principles. Experimental validation employed ASCII encoding and text encryption/decryption algorithms, demonstrating successful cryptographic processing of confidential data over fiber-optic lines. The results show that magneto-optical qubit control mechanisms enable modeling diverse waveguide-based logic gates, including a half adder performing parallel XOR and AND operations. These devices facilitate novel information processing and transmission architectures.

Optical and Computational Technologies for Measurements and Industrial Applications (OptiComp)•Sep 23, 2025•0 citations

Femtosecond laser direct writing of optical quantum logic gates

Qian Zhang, Meng Li, Qihuang Gong +1 more

Unlike classical digital computers in which a bit can represent either 1 or 0 at any time, quantum computers use a two-level system, i.e., a qubit, to implement logical operations based on quantum mechanical laws, which can represent both values at once. Owing to the superposition property of qubits, quantum computers have natural parallel processing advantages and thus have potential to exceed the computational efficiency of classical computers for particular tasks. Quantum logic gates are the generalization of classical logic gates in computational networks. It has been proved that two-qubit quantum gates together with one-qubit quantum gates are adequate for constructing networks with any possible quantum computational property. Directional couplers are the most critical elementsfor constructing the quantum gates. In recent years, photonic quantum technologies have emerged as a promising experimental platform for quantum computing. Single photons have robust noise resistance, long coherence time, high transmission speed and great compatibility with other systems. They can be easily manipulated and encoded in any of several degrees of freedom, for example, polarization, path, spatial mode or time bin. Optical waveguide technology enables the realizing of complex optical schemes comprised of many elements with desired scalability, stability and miniaturization. Femtosecond laser direct writing of waveguide has been adopted as a powerful tool for integrated quantum photonics with characteristics of rapidness, cost-effectiveness, mask-less and single-step process. In particular, it has the ability to build arbitrary three-dimensional circuits directly inside bulk materials, which is impossible to achieve with conventional lithography. In this article we review the femtosecond laser writing and quantum characterization of directional coupler and important one-qubit and two-qubit optical quantum logic gates, such as Hadamard gate, Pauli-X gate, controlled-NOT gate, and controlled-Phase gate. The qubits in these gates are usually encoded through optical paths or polarizations of photons. The key to the realization of polarization-encoded one-qubit gates is to achieve flexible wave-plate operations, which is described in detail. Controlled-NOT gate and controlled-phase gate are the most crucial two-qubit gates in the linear optics computation and sometimes they can be converted into each other by adding some one-qubit gates or special superposition states. Many different kinds of waveguide circuits have been used to implement these two-qubit gates. The outlook and challenges for the femtosecond laser writing of three-qubit gates, such as Toffoli gate and Fredkin gate, are briefly introduced.

Acta Physica Sinica•Jan 1, 2019•4 citations

Logical operations with single x-ray photons via dynamically-controlled nuclear resonances

Jonas Gunst, Christoph H. Keitel, Adriana Pálffy

Photonic qubits lie at the heart of quantum information technology, often encoding information in their polarization state. So far, only low-frequency optical and infrared photons have been employed as flying qubits, as the resources that are at present easiest to control. With their essentially different way of interacting with matter, x-ray qubits would bear however relevant advantages: they are extremely robust, penetrate deep through materials, and can be focused down to few-nm waveguides, allowing unprecedented miniaturization. Also, x-rays are resonant to nuclear transitions, which are very well isolated from the environment and present long coherence times. Here, we show theoretically that x-ray polarization qubits can be dynamically controlled by nuclear Mössbauer resonances. The control knob is played by nuclear hyperfine magnetic fields, that allow via fast rotations precise processing of single x-ray quanta polarization. With such rotations, single-qubit and binary logical operations such as a destructive C-NOT gate can be implemented.

arXiv:1506.00517•Scientific Reports•Apr 27, 2016•27 citations

Examination of logic operations with silent phase qubit

N. V. Klenov, Victor K. Kornev, A. Vedyayev +3 more

Reduced control Hamiltonian of the silent phase qubit has been found and dependence of the Hamiltonian matrix elements on applied magnetic field has been analyzed. The obtained results yield in concept of qubit logic operations accomplished by means of magnetic field application. One can propose a set of the qubits, each designed for specific logic operation. The qubit logic specialization may be fixed by both the junction current-phase relation and the characteristic Josephson-to-Coulomb energy ratio s. As current-phase relation is assigned, the qubit specialization can be tuned by the ratio s which varies with Josephson junction area. Examples of some logic operations are considered. Estimation of both the decoherence time and the quality factor Q has been obtained for such a qubit based on high-T c superconductors, which could provide the required current-phase relation.

Journal of Physics Conference Series•Feb 1, 2008•17 citations

Quantum logical gates operating on stored light

Karolina Słowik, Andrzej Raczyński, Jarosław Zaremba +1 more

An implementation is proposed of single qubit gates, e.g., phase, NOT, \sqrt{NOT} and Hadamard, operating on polarized photons and based on light storage. Instead of processing photons themselves, qubit transformations are performed on atomic excitations due to photon storage in a medium of atoms in the tripod configuration.

arXiv:1102.3266•Feb 16, 2011•0 citations
Abstract Results of studying properties of magnetooptical waveguide logic gates are presented. Simple logical operations can be implemented by changing photon states in a substance under the action of a modulating magnetic field. Varying the amplitude and orientation of the magnetic field relative to the light propagation direction, choosing the orientation of the polarizer and analyzer and appropriate configuration of the waveguide, one can design logic gates, including ones for qubit models. In doing this, the time barrier of low coherence peculiar to optical qubits is passed.
This paper presents a study of magneto-optical waveguide logic gates for optical communication systems. Simple logic operations are implemented by modulating photon states in a material through applied magnetic fields. By controlling the magnetic field's amplitude and orientation relative to light propagation, selecting polarizer/analyzer alignment, and configuring waveguides, we designed logic gates including qubit-compatible models that overcome the low coherence times typical of optical qubits. Optical qubits are promising candidates for quantum information processing and data transmission. For cryptographic applications using Vernam encryption, we developed an XOR logic gate simulator based on magneto-optical principles. Experimental validation employed ASCII encoding and text encryption/decryption algorithms, demonstrating successful cryptographic processing of confidential data over fiber-optic lines. The results show that magneto-optical qubit control mechanisms enable modeling diverse waveguide-based logic gates, including a half adder performing parallel XOR and AND operations. These devices facilitate novel information processing and transmission architectures.
Unlike classical digital computers in which a bit can represent either 1 or 0 at any time, quantum computers use a two-level system, i.e., a qubit, to implement logical operations based on quantum mechanical laws, which can represent both values at once. Owing to the superposition property of qubits, quantum computers have natural parallel processing advantages and thus have potential to exceed the computational efficiency of classical computers for particular tasks. Quantum logic gates are the generalization of classical logic gates in computational networks. It has been proved that two-qubit quantum gates together with one-qubit quantum gates are adequate for constructing networks with any possible quantum computational property. Directional couplers are the most critical elementsfor constructing the quantum gates. In recent years, photonic quantum technologies have emerged as a promising experimental platform for quantum computing. Single photons have robust noise resistance, long coherence time, high transmission speed and great compatibility with other systems. They can be easily manipulated and encoded in any of several degrees of freedom, for example, polarization, path, spatial mode or time bin. Optical waveguide technology enables the realizing of complex optical schemes comprised of many elements with desired scalability, stability and miniaturization. Femtosecond laser direct writing of waveguide has been adopted as a powerful tool for integrated quantum photonics with characteristics of rapidness, cost-effectiveness, mask-less and single-step process. In particular, it has the ability to build arbitrary three-dimensional circuits directly inside bulk materials, which is impossible to achieve with conventional lithography. In this article we review the femtosecond laser writing and quantum characterization of directional coupler and important one-qubit and two-qubit optical quantum logic gates, such as Hadamard gate, Pauli-X gate, controlled-NOT gate, and controlled-Phase gate. The qubits in these gates are usually encoded through optical paths or polarizations of photons. The key to the realization of polarization-encoded one-qubit gates is to achieve flexible wave-plate operations, which is described in detail. Controlled-NOT gate and controlled-phase gate are the most crucial two-qubit gates in the linear optics computation and sometimes they can be converted into each other by adding some one-qubit gates or special superposition states. Many different kinds of waveguide circuits have been used to implement these two-qubit gates. The outlook and challenges for the femtosecond laser writing of three-qubit gates, such as Toffoli gate and Fredkin gate, are briefly introduced.
Photonic qubits lie at the heart of quantum information technology, often encoding information in their polarization state. So far, only low-frequency optical and infrared photons have been employed as flying qubits, as the resources that are at present easiest to control. With their essentially different way of interacting with matter, x-ray qubits would bear however relevant advantages: they are extremely robust, penetrate deep through materials, and can be focused down to few-nm waveguides, allowing unprecedented miniaturization. Also, x-rays are resonant to nuclear transitions, which are very well isolated from the environment and present long coherence times. Here, we show theoretically that x-ray polarization qubits can be dynamically controlled by nuclear Mössbauer resonances. The control knob is played by nuclear hyperfine magnetic fields, that allow via fast rotations precise processing of single x-ray quanta polarization. With such rotations, single-qubit and binary logical operations such as a destructive C-NOT gate can be implemented.
Reduced control Hamiltonian of the silent phase qubit has been found and dependence of the Hamiltonian matrix elements on applied magnetic field has been analyzed. The obtained results yield in concept of qubit logic operations accomplished by means of magnetic field application. One can propose a set of the qubits, each designed for specific logic operation. The qubit logic specialization may be fixed by both the junction current-phase relation and the characteristic Josephson-to-Coulomb energy ratio s. As current-phase relation is assigned, the qubit specialization can be tuned by the ratio s which varies with Josephson junction area. Examples of some logic operations are considered. Estimation of both the decoherence time and the quality factor Q has been obtained for such a qubit based on high-T c superconductors, which could provide the required current-phase relation.