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Radiation-suppressed superconducting quantum bit in a planar geometry
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Chip layout. The device consists of two transmon qubits capacitively coupled to a microstrip resonator with a continuous superconducting ground plane on the backside. The resonator and the large qubit pads are made from TiN whereas the Josephson junction interconnecting the pads is made from Al/AlO x /Al. (b) Illustration of a dipole (the qubit in this case) at the distance h above a superconducting plane. The plane generates a mirror image of opposite charge (±q) that acts to suppress the radiation from the dipole. (c) Detailed dimensions of the qubit capacitor pads.

Image of FIG. 2.
FIG. 2.

(a) Measured relaxation time for the two qubits. We extract a T 1 time of 11.7 ± 0.2 μs and 2.1 ± 0.1 μs for qubit 1 and qubit 2, respectively. (b) Ramsey fringes for the two qubits. The extracted decoherence times T 2 are 8.1 ± 0.3 μs and 3.5 ± 0.2 μs for qubit 1 and qubit 2, respectively. From spin echo measurements (not shown here) decoherence times Techo of 9.6 ± 0.5 μs and 4.6 ± 0.2 μs for q1 and q2 were extracted.

Image of FIG. 3.
FIG. 3.

Calculated relaxation time due to radiation losses for a qubit above a superconducting plane on the back side of the 5 × 5 mm2 substrate. The spacing between the qubit and the plane is set by the substrate thickness. The inset shows the expected relaxation time as a function of chip side length for a 350 μm thick substrate.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Radiation-suppressed superconducting quantum bit in a planar geometry