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Stabilizing Remote Entanglement via Waveguide Dissipation
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DOI：10.1103/PRXQuantum.5.030346.png)
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Abstract
En 中文
Distributing entanglement between remote sites is integral to quantum networks. Here, we demonstrate the autonomous stabilization of remote entanglement between a pair of noninteracting superconducting qubits connected by an open waveguide on a chip. In this setting, the interplay between a classical continuous drive-supplied through the waveguide-and dissipation into the waveguide stabilizes the qubit pair in a dark state, which, asymptotically, takes the form of a Bell state. We use field-quadrature measurements of the photons emitted to the waveguide to perform quantum state tomography on the stabilized states, where we find a concurrence of 0.504(-0.029)(+0.007) in the optimal setting with a stabilization time constant of 56 +/- 4 ns. We examine the imperfections within our system and discuss avenues for enhancing fidelities and achieving scalability in future work. The decoherence-protected steady-state remote entanglement offered via dissipative stabilization may find applications in distributed quantum computing, sensing, and communication.
Keywords:
QUANTUM COMPUTATION
PYTHON FRAMEWORK
STATE
DYNAMICS
INEQUALITY
DRIVEN
QUTIP