Time-Reversal Symmetrization of Spontaneous Emission for High Fidelity Quantum State Transfer

TL;DR

This paper demonstrates a method to shape the emission profile of photons from a superconducting qubit into a symmetric form, enhancing quantum state transfer fidelity between distant atoms.

Contribution

It introduces a tunable coupling technique that allows for time-reversal symmetrization of spontaneous emission without changing the emission frequency.

Findings

Successfully shaped photon emission into a symmetric profile

Achieved rapid tuning of qubit-cavity coupling strength

Enhanced potential for high-fidelity quantum communication

Abstract

We demonstrate the ability to control the spontaneous emission from a superconducting qubit coupled to a cavity. The time domain profile of the emitted photon is shaped into a symmetric truncated exponential. The experiment is enabled by a qubit coupled to a cavity, with a coupling strength that can be tuned in tens of nanoseconds while maintaining a constant dressed state emission frequency. Symmetrization of the photonic wave packet will enable use of photons as flying qubits for transfering the quantum state between atoms in distant cavities.