Quantum dial
Aashish Sah, Suman Kundu, Priyank Singh, Eemeli Forsbom, Vasilii Vadimov, Mikko M\"ott\"onen

TL;DR
The paper introduces a quantum dial device that dynamically controls the coupling of a qubit to its environment, enabling fast switching between isolation for coherence and strong coupling for control, thereby improving quantum processor performance.
Contribution
It presents the first implementation of a quantum dial using a band-stop filter to tune qubit-environment coupling on nanosecond timescales without significant Stark shifts.
Findings
Achieved >150 μs T1 in reset mode, reduced to ~200 ns
Demonstrated high-fidelity qubit control with 99.99% idle and 99.9% gate fidelities
Enabled sensitive thermometry of the qubit environment
Abstract
Accurate control of quantum degrees of freedom is promising for sensing, communication, and computing, but building a useful quantum computer faces a central isolation-and-control challenge: qubits must remain well isolated from their environment to preserve coherence, yet also be coupled strongly enough for control, readout, and reset. Existing approaches address this challenge only partially, using separate reset elements, drive schemes, and Purcell filters, often with added complexity and tradeoffs such as heating and crosstalk. Here we introduce and demonstrate a first-generation quantum dial: a device that on demand mediates the coupling of a qubit to selected auxiliary degrees of freedom. Our implementation uses a band-stop filter between a high-coherence transmon qubit and a broadband transmission line, enabling the coupling strength to be tuned by several orders of magnitude on…
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Taxonomy
TopicsMechanical and Optical Resonators · Quantum Information and Cryptography · Quantum optics and atomic interactions
