Publication record · 18.cifr/2001.kielpinski.dfs-quantum-memory

A Decoherence-Free Quantum Memory Using Trapped Ions

v1.0.0

D. Kielpinski (National Institute of Standards and Technology), V. Meyer (National Institute of Standards and Technology), M. A. Rowe (National Institute of Standards and Technology), C. A. Sackett (National Institute of Standards and Technology), W. M. Itano (National Institute of Standards and Technology), C. Monroe (University of Michigan), D. J. Wineland (National Institute of Standards and Technology)

RAI18.cifr/2001.kielpinski.dfs-quantum-memory

Science· 2001· doi:10.1126/science.1057357

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.

decoherence-free subspacetrapped ionsquantum memoryqubitdephasingquantum error suppression

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Problem solved

Decoherence from ambient magnetic field fluctuations limits single trapped-ion qubit storage times. Collective dephasing — where all ions see the same noise — is the dominant channel in ion traps. DFS encoding exploits the symmetry of this noise to create a noise-immune logical qubit, solving the storage-time bottleneck without requiring active error correction.

Novelty

First experimental demonstration of a DFS quantum memory in trapped ions, encoding one logical qubit into the collective-dephasing-free subspace of two 9Be+ ions. Achieves ~10x longer storage times than single-ion qubits under both ambient and engineered noisy environments. Demonstrates reversible arbitrary-qubit encoding into and out of the DFS.

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