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Researchers have developed the inductively protected Andreev (IPA) qubit by integrating linear inductors into spin-qubit circuits to create distinct potential wells. This architecture nearly eliminates wavefunction overlap and significantly extends relaxation times compared to standard designs, addressing a key bottleneck for quantum memory stability. The resulting platform combines the long coherence of fluxonium-like systems with the operational flexibility of electron spins, offering a promising path toward more scalable fault-tolerant processors.

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Researchers Extend Qubit Coherence Using Inductive Protection

Quantum ZeitgeistAugust 17, 20263 min read

Inductively-protected Andreev (IPA) spin qubit By separating spin-qubit states into distinct potential wells, a new design nearly eliminates wavefunction overlap, offering enhanced protection against energy loss. This inductively-protected Andreev (IPA) qubit combines the benefits of long coherence times with the operational advantages of a spin degree of freedom, improving upon existing qubit architectures. The result is a potentially more stable and controllable platform for quantum computation.

Adding a linear inductor to an Andreev spin qubit enhances its relaxation time by creating separate potential wells for each spin state, nearly eliminating wavefunction overlap. J. L. del Olmo N. and colleagues from Wales and Canberra have shown that this design, termed the inductively protected Andreev (IPA) qubit, achieves a phase separation up to φIPA ≲2π, combining long coherence with…

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