Faithful state transfer between two-level systems via an actively cooled finite-temperature cavity

Abstract

We consider state transfer between two qubits - effective two-level systems represented by Rydberg atoms - via a common mode of a microwave cavity at finite temperature. We find that when both qubits have the same coupling strength to the cavity field, at large enough detuning from the cavity mode frequency, quantum interference between the transition paths makes the swap of the excitation between the qubits largely insensitive to the number of thermal photons in the cavity. When, however, the coupling strengths are different, the photon number-dependent differential Stark shift of the transition frequencies precludes efficient transfer. Nevertheless, using an auxiliary cooling system to continuously extract the cavity photons, we can still achieve a high-fidelity state transfer between the qubits.

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• Absolute frequency measurement of rubidium 5S-6P transitions
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• Controlling the dipole blockade and ionization rate of Rydberg atoms in strong electric fields
• Cavity-enhanced Ramsey spectroscopy at a Rydberg-atom-superconducting-circuit interface
• Population transfer via a finite temperature state
• Quantum gates between distant atoms mediated by a Rydberg excitation antiferromagnet
• Strong coupling and active cooling in a finite temperature hybrid atom-cavity system
• A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms