Stabilizing remote entanglement via waveguide dissipation

Kavli Affiliate: Mohammad Mirhosseini

| First 5 Authors: Parth S. Shah, Frank Yang, Chaitali Joshi, Mohammad Mirhosseini,

| Summary:

Distributing entanglement between remote sites is integral to quantum
networks. Here, we demonstrate the autonomous stabilization of remote
entanglement between a pair of non-interacting 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
$0.504^{+0.007}_{-0.029}$ in the optimal setting with a stabilization time
constant of 56 $pm$ 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.

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