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Deterministic teleportation of a quantum gate between two logical qubits.(Report)

Chou, Kevin S. ; Blumoff, Jacob Z. ; Wang, Christopher S. ; Reinhold, Philip C. ; Axline, Christopher J. ; Gao, Yvonne Y. ; Frunzio, L.

Nature, 2018, Vol.561(7723), p.368 [Periódico revisado por pares]

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  • Título:
    Deterministic teleportation of a quantum gate between two logical qubits.(Report)
  • Autor: Chou, Kevin S. ; Blumoff, Jacob Z. ; Wang, Christopher S. ; Reinhold, Philip C. ; Axline, Christopher J. ; Gao, Yvonne Y. ; Frunzio, L.
  • Assuntos: Quantum Mechanics – Research
  • É parte de: Nature, 2018, Vol.561(7723), p.368
  • Descrição: A quantum computer has the potential to efficiently solve problems that are intractable for classical computers. However, constructing a large-scale quantum processor is challenging because of the errors and noise that are inherent in real-world quantum systems. One approach to addressing this challenge is to utilize modularity--a strategy used frequently in nature and engineering to build complex systems robustly. Such an approach manages complexity and uncertainty by assembling small, specialized components into a larger architecture. These considerations have motivated the development of a quantum modular architecture, in which separate quantum systems are connected into a quantum network via communication channels.sup.1,2. In this architecture, an essential tool for universal quantum computation is the teleportation of an entangling quantum gate.sup.3-5, but such teleportation has hitherto not been realized as a deterministic operation. Here we experimentally demonstrate the teleportation of a controlled-NOT (CNOT) gate, which we make deterministic by using real-time adaptive control. In addition, we take a crucial step towards implementing robust, error-correctable modules by enacting the gate between two logical qubits, encoding quantum information redundantly in the states of superconducting cavities.sup.6. By using such an error-correctable encoding, our teleported gate achieves a process fidelity of 79 per cent. Teleported gates have implications for fault-tolerant quantum computation.sup.3, and when realized within a network can have broad applications in quantum communication, metrology and simulations.sup.1,2,7. Our results illustrate a compelling approach for implementing multi-qubit operations on logical qubits and, if integrated with quantum error-correction protocols, indicate a promising path towards fault-tolerant quantum computation using a modular architecture. A teleported controlled-NOT gate is realized experimentally between two logical qubits implemented as superconducting cavity quantum memories, thus demonstrating an important tool for universal computation in a quantum modular architecture.
  • Idioma: Inglês

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