A quantum-logic gate between distant quantum-network modules

Daiss, Severin; Langenfeld, Stefan; Welte, Stephan; Distante, Emanuele; Thomas, Philip; Hartung, Lukas; Morin, Olivier; Rempe, Gerhard

doi:10.1126/science.abe3150

Cited by 138 publications

(84 citation statements)

References 32 publications

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“…The presented quantum memory with high efficiency and low excess noise makes the possibility of preserving optical quantum states such as the squeezed light. The memory system with high efficiency and low excess noise has been able to be directly applied in executing quantum logic gates [6,7] between quantum-network modules (nodes) connected in a small range and realizing sub-QNL atomic magnetometry [9].…”

Section: Resultsmentioning

confidence: 99%

“…For scaling up the computational power, modular quantum processors provide a solution by integrating smaller quantum modules to a larger computing cluster. Modular quantum platforms are to keep smaller individual processing units, then connect them to one another via quantum entanglement among multiple quantum-network modules, and thereby implement more 2 complex quantum operations, such as distributed quantum logic gates [6,7]. Enhancing the ability to entangle different modules (nodes) is significant for achieving such a modular approach, and its realizing depends on the memory fidelity of storing the multipartite entangled optical modes among quantum modules (nodes).…”

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confidence: 99%

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High-performance cavity-enhanced quantum memory with warm atomic cell

Liu

Yan

et al. 2021

Preprint

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High-performance quantum memory for quantized states of light is a prerequisite building block of quantum information technology. Despite great progresses of optical quantum memories based on interactions of light and atoms, physical features of these memories still can not satisfy the requirement for applications in practical quantum information systems, since all of them suffer from trade off between memory efficiency and excess noise. Here, we report a high-performance cavity-enhanced electromagnetically-induced-transparency memory with warm atomic cell in which a scheme of optimizing the spatial and temporal modes based on the time-reversal approach is applied. A quantum memory with the efficiency up to 78 + 1% and the noise level close to quantum noise limit has been experimentally achieved. The realized quantum memory platform has been capable of preserving quantized optical states, and thus is ready to be applied in quantum information systems, such as distributed quantum logic gates and quantum-enhanced atomic magnetometry.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

High-performance cavity-enhanced quantum memory with warm atomic cell

Liu

Yan

et al. 2021

Preprint

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“…By integrating smaller quantum modules to a larger computing cluster, distributed quantum structure can be used to solve the unavoidable decoherence problem in a large‐scale quantum processor, where the quantum memory based element registers can preserve, control and read out quantum states. [ 93 ] Besides, the ultimate measurement sensitivity is restricted by the QNL. Spin squeezing generated by storing the squeezed optical mode provides an effective approach to overcome this limit, and enables to improve the sensitivity of atomic magnetometry.…”

Section: Discussionmentioning

confidence: 99%

Quantum Entanglement Among Multiple Memories for Continuous Variables

Yan

Jia

et al. 2021

Adv Quantum Tech

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Quantum network is constituted by quantum channels and quantum nodes. The interaction between non‐classical optical modes and quantum nodes, as well as quantum entanglement among multiple distant quantum nodes are the building blocks of quantum network, which enable to achieve a plethora of quantum information protocols, such as distributed quantum computation, quantum state transfer across quantum nodes, and quantum clock network. On one hand, the multipartite non‐classical states of optical modes, which can directly interact with atomic ensembles, are required for the practical applications of quantum network. On the other hand, a crucial goal of quantum network is to unconditionally generate and on‐demand store and retrieve multipartite entangled states in atomic ensembles. This paper presents an up‐to‐date review on recent developments in these areas: multipartite continuous‐variable polarization entangled optical modes have been created by transforming quantum state from quadrature into polarization components; and a scalable quantum network with deterministic entanglement among multiple quantum memories has been constructed by transferring spatially separated entangled optical modes into atomic ensembles.

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“…Note that quantum links, or more generally a quantum network, will rely on the coherent transfer of quantum information and is, in itself, a very challenging task. [ 24–26 ] These links are important not only to allow room for incorporating control electronics, but also for improving the connectivity of the qubit arrays. They may also be used to connect qubits in separate chips (instead of monolithically integrated qubits), but this only represents a minimal gain in terms of scalability.…”

Section: Introductionmentioning

confidence: 99%

Materials for Silicon Quantum Dots and their Impact on Electron Spin Qubits

Saraiva

Lim

Yang

et al. 2021

Adv Funct Materials

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Quantum computers have the potential to efficiently solve problems in logistics, drug and material design, finance, and cybersecurity. However, millions of qubits will be necessary for correcting inevitable errors in quantum operations. In this scenario, electron spins in gate‐defined silicon quantum dots are strong contenders for encoding qubits, leveraging the microelectronics industry know‐how for fabricating densely populated chips with nanoscale electrodes. The sophisticated material combinations used in commercially manufactured transistors, however, will have a very different impact on the fragile qubits. Here some key properties of the materials that have a direct impact on qubit performance and variability are reviewed.

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A quantum-logic gate between distant quantum-network modules

Cited by 138 publications

References 32 publications

High-performance cavity-enhanced quantum memory with warm atomic cell

High-performance cavity-enhanced quantum memory with warm atomic cell

Quantum Entanglement Among Multiple Memories for Continuous Variables

Materials for Silicon Quantum Dots and their Impact on Electron Spin Qubits

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