H2020Индивидуална стипендия2016–2018

SUPEREOM · Microwave-to-Optical Quantum Link: Quantum Teleportation and Quantum Illumination with cavity Optomechanics

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

Период: 2016-04-01 → 2018-03-31
Финансиране от ЕС: 178 157 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Микрочипове за управление на сигналите в квантовите компютри се разработват чрез създаване на миниатюрни, немагнитни „кръгови кръстовища“ за фотони. Те помагат за намаляване на размера на устройствата и предпазват чувствителните квантови битове от смущения.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Microwave-to-Optical Quantum Link: Quantum Teleportation and Quantum Illumination with cavity Optomechanics

Qubits, or quantum bits, are the key building blocks at the heart of every quantum computer. In order to perform a computation, signals are directed to and from qubits. However, qubits are extremely sensitive to interference from their environment, and need to be shielded from outside signals, in particular from magnetic fields. It is a serious problem that the devices built to shield qubits from unwanted signals, known as nonreciprocal devices, produce magnetic fields themselves. Moreover, they are several centimeters in size, which is problematic, given that a large number of such elements is required in each quantum processor. We have decreased the size of nonreciprocal devices by two orders of magnitude. Their device, which they compare to a traffic roundabout for photons, is only about a tenth of a millimeter in size, and—more importantly—it is not magnetic. We have implemented the first nonreciprocal mechanical on-chip microwave circulator. Directional circulation is achieved with controlled phase-sensitive interference of six distinct electro-mechanical signal conversion paths. The presented circulator is compact, its silicon-on-insulator platform is compatible with both superconducting qubits and silicon photonics, and its noise performance is close to the quantum limit. This frequency tunable and in situ reconfigurable signal processing device can be used as a filter, wavelength converter, beam splitter, isolator or circulator for microwave photons and it paves the way to implement the on-chip microwave to optical converter. Beside that we have developed the theory of and discuss a potential realization for the controllable flow of thermal noise in quantum systems. We have demonstrated theoretically that the unidirectional flow of thermal noise is possible within quantum cascaded systems.

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

Цел на проекта

Quantum processing promises exponential speedups for certain computational problems and superconducting circuits are believed to be a scalable platform for this future era of information technology. One problem is that superconducting systems operate in the microwave regime where quantum communication via room temperature channels becomes impossible due to transmission losses and electronic noise. The main scientific objective of the proposed project is the experimental demonstration of a quantum coherent link between distant superconducting microwave circuits using fiber optic technology. In order to show the effectiveness of our on-chip integrated acousto-optic converter we will work towards two closely related applications with high scientific impact. Continuous variable quantum teleportation could form one of the basic building blocks to establish large-scale quantum networks. We will use Josephson parametric amplifiers to generate squeezed states of light, which will be upconverted to the telecom band, distributed via fiber optics, downconverted and detected using advanced microwave tomography methods. Microwave quantum illumination on the other hand utilizes the generated entanglement between microwave and optical photons, using electro-opto-mechanical converter, to detect extremely weak signals in the presence of a noisy background with sensitivities inaccessible with classical technology. The proposed on-chip integrated converter is already under development and will be based on the parametrically enhanced electro-opto-mechanical coupling between a mechanically compliant telecom wavelength photonic crystal cavity and a capacitively coupled compact superconducting LC resonator. Compared to traditional acousto-optic modulators our resonator-based system has a limited bandwidth but it works at modulation powers corresponding to only a single intra-cavity microwave photon, which in turn enables high fidelity quantum-limited operation of the device.

Оригинален текст от CORDIS (на английски).

Участници

INSTITUTE OF SCIENCE AND TECHNOLOGY AUSTRIA · KlosterneuburgКоординаторАвстрия