H2020Индивидуална стипендия2021–2023

LASERLOOP · Laser loop for engineering long-distance interactions in hybrid quantum systems

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2021-03-01 → 2023-02-28
Финансиране от ЕС: 191 149 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Кохерентната обратна връзка се изследва като начин за управление на квантови системи, например механични осцилатори, без да се извършва измерване на състоянието им. Това помага за подобряване на контрола върху квантовите процеси, като се избегне необратимото променяне на системата при измерване.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Laser loop for engineering long-distance interactions in hybrid quantum systems

The ability to control and manipulate quantum systems has given rise to new applications in fields such as quantum computing, quantum communication, and quantum sensing. One of the fundamental techniques used in controlling quantum systems is feedback. Feedback techniques which are measurement-based rely on measuring the state of a system, processing the extracted information, and manipulating a specific actuator to drive the system towards a desired target state. However, this technique has a genuine drawback in the quantum scenario. The measurement irreversibly modifies the state of the system, leading to undesired backaction. Therefore, the question arises, is it necessary to measure a system to control it? It turns out, it is not. There is a different kind of feedback, known as coherent feedback, which does not require measuring the state of the system. Instead, one can process the quantum information encoded in the state by making the system under control interact with another one, which can be a quantum mechanical one. Coherent feedback has the potential to improve quantum control techniques and provide new capabilities in a broad range of physical systems. The project focused on exploring the potential of coherent feedback as an alternative to measurement-based feedback for controlling quantum systems, particularly in the context of atomic and optomechanical systems. The objective of the project was to investigate the performance and limitations of coherent feedback in atomic physics and optomechanics, with the goal of improving quantum control techniques over the motion of mechanical oscillators.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Light is a powerful carrier of quantum information and an established tool to manipulate matter at the quantum level. In this action, we explore a novel technique of using light in quantum physics and technology: As a means to generate for the first time strong, quantum coherent interactions between different systems over macroscopic distances. Our approach relies on a laser loop that connects the systems and mediates coherent bidirectional interactions between them. This is possible due to a destructive interference of the quantum noise introduced by the light, otherwise responsible for decoherence. At the same time, information is erased from the output field, making the loop effectively closed to the environment. This makes it possible to achieve quantum coherent coupling between the two systems.We will use this technique to couple a nanomechanical oscillator and an atomic spin ensemble in the quantum regime and we will engineer a variety of different interactions between them. This enables the generation of state-swaps and two-mode squeezing, offering new possibilities for the quantum control of the motion of macroscopic objects. Another particular focus will be understanding the role of the environment in quantum physics, which requires to induce dissipation in a controlled manner. The laser loop scheme proposed in this action allows to engineer such an environment, and to profit from the large parameter tunability of atomic and nanomechanical devices to study the physics of non-Hermitian systems. These feature degeneracies known as exceptional points, showing remarkable properties such as enhanced sensitivity to external parameters. Exceptional points have mainly been investigated so far in a classical context and will be studied in this project in a hybrid quantum system.The research in this action will extend the toolbox for engineering long-distance interactions in quantum networks, also with relevance for quantum sensing and simulation.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITAT BASEL · BaselКоординаторШвейцария