The subgap current in Nb ∕ AlOx ∕ Nb tunnel junctions
We have measured the subgap current at 0.8 K in several hysteretic 1.5 × 1.6 and 2.6 × 2.6 μ m 2 Nb ∕ AlOx ∕ Nb tunnel junctions. In zero magnetic field, the critical current I c ∼ 8 μ A and the subgap resistance R ∼ 0.3 M Ω . When we apply a magnetic field, I c can be as low as 1 nA, and R is large...
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| Veröffentlicht in: | Applied physics letters 2004-12, Vol.85 (24), p.5941-5943 |
|---|---|
| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | We have measured the subgap current at 0.8 K in several hysteretic
1.5
×
1.6
and
2.6
×
2.6
μ
m
2
Nb
∕
AlOx
∕
Nb
tunnel junctions. In zero magnetic field, the critical current
I
c
∼
8
μ
A
and the subgap resistance
R
∼
0.3
M
Ω
. When we apply a magnetic field,
I
c
can be as low as 1 nA, and
R
is larger than 1 GΩ. This means that in a superconducting qubit made using Nb tunnel junctions, the decoherence rate from the quasiparticle conductance may be as low as
1
∕
(
100
μ
s
)
. |
|---|---|
| ISSN: | 0003-6951 1077-3118 |
| DOI: | 10.1063/1.1836016 |