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Updated: Jul 21, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
A decoherence-free quantum memory using trapped ions
D Kielpinski1, V Meyer, M A Rowe
1Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80305, USA. davidk@boulder.nist.gov
Abstract:
We demonstrate a decoherence-free quantum memory of one qubit. By encoding the qubit into the decoherence-free subspace (DFS) of a pair of trapped 9Be+ ions, we protect the qubit from environment-induced dephasing that limits the storage time of a qubit composed of a single ion. We measured the storage time under ambient conditions and under interaction with an engineered noisy environment and observed that encoding into the DFS increases the storage time by up to an order of magnitude. The encoding reversibly transfers an arbitrary qubit stored in a single ion to the DFS of two ions.
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