As the field of quantum computing progresses to larger-scale devices, multiplexing will be crucial to scale quantum processors. While multiplexed readout is common practice for superconducting devices, relatively little work has been reported about the combination of flux and microwave control lines. Here, we present a method to integrate a microwave line and a flux line into a single “XYZ line.” This combined control line allows us to perform fast single-qubit gates as well as to deliver flux signals to the qubits. The measured relaxation times of the qubits are comparable to state-of-the-art devices employing separate control lines. We benchmark the fidelity of single-qubit gates with randomized benchmarking, achieving a fidelity as high as 99.93±0.04%, and we demonstrate that XYZ lines can in principle be used to run parametric entangling gates.

1.
S.
Sheldon
,
L. S.
Bishop
,
E.
Magesan
,
S.
Filipp
,
J. M.
Chow
, and
J. M.
Gambetta
, “
Characterizing errors on qubit operations via iterative randomized benchmarking
,”
Phys. Rev. A
93
,
012301
(
2016
).
2.
M.
Rol
,
C.
Bultink
,
T.
O'Brien
,
S.
De Jong
,
L.
Theis
,
X.
Fu
,
F.
Luthi
,
R.
Vermeulen
,
J.
de Sterke
,
A.
Bruno
 et al., “
Restless tuneup of high-fidelity qubit gates
,”
Phys. Rev. Appl.
7
,
041001
(
2017
).
3.
Y.
Sung
,
L.
Ding
,
J.
Braumüller
,
A.
Vepsäläinen
,
B.
Kannan
,
M.
Kjaergaard
,
A.
Greene
,
G. O.
Samach
,
C.
McNally
,
D.
Kim
 et al., “
Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
,” arXiv:2011.01261 (
2020
).
4.
S. S.
Hong
,
A. T.
Papageorge
,
P.
Sivarajah
,
G.
Crossman
,
N.
Didier
,
A. M.
Polloreno
,
E. A.
Sete
,
S. W.
Turkowski
,
M. P.
da Silva
, and
B. R.
Johnson
, “
Demonstration of a parametrically activated entangling gate protected from flux noise
,”
Phys. Rev. A
101
,
012302
(
2020
).
5.
E.
Jeffrey
,
D.
Sank
,
J.
Mutus
,
T.
White
,
J.
Kelly
,
R.
Barends
,
Y.
Chen
,
Z.
Chen
,
B.
Chiaro
,
A.
Dunsworth
 et al., “
Fast accurate state measurement with superconducting qubits
,”
Phys. Rev. Lett.
112
,
190504
(
2014
).
6.
T.
Walter
,
P.
Kurpiers
,
S.
Gasparinetti
,
P.
Magnard
,
A.
Potočnik
,
Y.
Salathé
,
M.
Pechal
,
M.
Mondal
,
M.
Oppliger
,
C.
Eichler
 et al., “
Rapid high-fidelity single-shot dispersive readout of superconducting qubits
,”
Phys. Rev. Appl.
7
,
054020
(
2017
).
7.
J.
Heinsoo
,
C. K.
Andersen
,
A.
Remm
,
S.
Krinner
,
T.
Walter
,
Y.
Salathé
,
S.
Gasparinetti
,
J.-C.
Besse
,
A.
Potočnik
,
A.
Wallraff
 et al., “
Rapid high-fidelity multiplexed readout of superconducting qubits
,”
Phys. Rev. Appl.
10
,
034040
(
2018
).
8.
F.
Arute
,
K.
Arya
,
R.
Babbush
,
D.
Bacon
,
J. C.
Bardin
,
R.
Barends
,
R.
Biswas
,
S.
Boixo
,
F. G.
Brandao
,
D. A.
Buell
 et al., “
Quantum supremacy using a programmable superconducting processor
,”
Nature
574
,
505
510
(
2019
).
9.
M.
Gong
,
S.
Wang
,
C.
Zha
,
M.-C.
Chen
,
H.-L.
Huang
,
Y.
Wu
,
Q.
Zhu
,
Y.
Zhao
,
S.
Li
,
S.
Guo
 et al., “
Quantum walks on a programmable two-dimensional 62-qubit superconducting processor
,”
Science
372
,
948
952
(
2021
).
10.
Y.
Wu
,
W.-S.
Bao
,
S.
Cao
,
F.
Chen
,
M.-C.
Chen
,
X.
Chen
,
T.-H.
Chung
,
H.
Deng
,
Y.
Du
,
D.
Fan
 et al., “
Strong quantum computational advantage using a superconducting quantum processor
,” arXiv:2106.14734 (
2021
).
11.
M.
Vahidpour
,
W.
O'Brien
,
J. T.
Whyland
,
J.
Angeles
,
J.
Marshall
,
D.
Scarabelli
,
G.
Crossman
,
K.
Yadav
,
Y.
Mohan
,
C.
Bui
 et al., “
Superconducting through-silicon vias for quantum integrated circuits
,” arXiv:1708.02226 (
2017
).
12.
D.-R. W.
Yost
,
M. E.
Schwartz
,
J.
Mallek
,
D.
Rosenberg
,
C.
Stull
,
J. L.
Yoder
,
G.
Calusine
,
M.
Cook
,
R.
Das
,
A. L.
Day
 et al., “
Solid-state qubits integrated with superconducting through-silicon vias
,”
npj Quantum Inf.
6
,
59
(
2020
).
13.
J.
Rahamim
,
T.
Behrle
,
M.
Peterer
,
A.
Patterson
,
P.
Spring
,
T.
Tsunoda
,
R.
Manenti
,
G.
Tancredi
, and
P.
Leek
, “
Double-sided coaxial circuit QED with out-of-plane wiring
,”
Appl. Phys. Lett.
110
,
222602
(
2017
).
14.
J.
Otterbach
,
R.
Manenti
,
N.
Alidoust
,
A.
Bestwick
,
M.
Block
,
B.
Bloom
,
S.
Caldwell
,
N.
Didier
,
E. S.
Fried
,
S.
Hong
 et al., “
Unsupervised machine learning on a hybrid quantum computer
,” arXiv:1712.05771 (
2017
).
15.
P.
Jurcevic
,
A.
Javadi-Abhari
,
L. S.
Bishop
,
I.
Lauer
,
D. F.
Bogorin
,
M.
Brink
,
L.
Capelluto
,
O.
Günlük
,
T.
Itoko
,
N.
Kanazawa
 et al., “
Demonstration of quantum volume 64 on a superconducting quantum computing system
,” arXiv:2008.08571 (
2020
).
16.
M.
Jerger
,
S.
Poletto
,
P.
Macha
,
U.
Hübner
,
E.
Il'ichev
, and
A. V.
Ustinov
, “
Frequency division multiplexing readout and simultaneous manipulation of an array of flux qubits
,”
Appl. Phys. Lett.
101
,
042604
(
2012
).
17.
J.
Kelly
,
R.
Barends
,
A. G.
Fowler
,
A.
Megrant
,
E.
Jeffrey
,
T. C.
White
,
D.
Sank
,
J. Y.
Mutus
,
B.
Campbell
,
Y.
Chen
 et al., “
State preservation by repetitive error detection in a superconducting quantum circuit
,”
Nature
519
,
66
69
(
2015
).
18.
J. C.
Bardin
,
D. H.
Slichter
, and
D. J.
Reilly
, “
Microwaves in quantum computing
,”
IEEE J. Microwaves
1
,
403
427
(
2021
).
19.
M.
Vahidpour
,
W.
O'Brien
,
J. T.
Whyland
,
J.
Angeles
,
J.
Marshall
,
D.
Scarabelli
,
G.
Crossman
,
K.
Yadav
,
Y.
Mohan
,
C.
Bui
,
V.
Rawat
,
R.
Renzas
,
N.
Vodrahalli
,
A.
Bestwick
, and
C.
Rigetti
, “
Superconducting through-silicon vias for quantum integrated circuits
,” arXiv:1708.02226 (
2017
).
20.
W.
O'Brien
,
M.
Vahidpour
,
J. T.
Whyland
,
J.
Angeles
,
J.
Marshall
,
D.
Scarabelli
,
G.
Crossman
,
K.
Yadav
,
Y.
Mohan
,
C.
Bui
 et al., “
Superconducting caps for quantum integrated circuits
,” arXiv:1708.02219 (
2017
).
21.
S.
Krinner
,
S.
Storz
,
P.
Kurpiers
,
P.
Magnard
,
J.
Heinsoo
,
R.
Keller
,
J.
Luetolf
,
C.
Eichler
, and
A.
Wallraff
, “
Engineering cryogenic setups for 100-qubit scale superconducting circuit systems
,”
EPJ Quantum Technol.
6
,
2
(
2019
).
22.
S.
Caldwell
,
N.
Didier
,
C.
Ryan
,
E.
Sete
,
A.
Hudson
,
P.
Karalekas
,
R.
Manenti
,
M.
da Silva
,
R.
Sinclair
,
E.
Acala
 et al., “
Parametrically activated entangling gates using transmon qubits
,”
Phys. Rev. Appl.
10
,
034050
(
2018
).
23.
A. D.
Córcoles
,
J. M.
Chow
,
J. M.
Gambetta
,
C.
Rigetti
,
J. R.
Rozen
,
G. A.
Keefe
,
M. B.
Rothwell
,
M. B.
Ketchen
, and
M.
Steffen
, “
Protecting superconducting qubits from radiation
,”
Appl. Phys. Lett.
99
,
181906
(
2011
).
24.
R.
Barends
,
J.
Wenner
,
M.
Lenander
,
Y.
Chen
,
R. C.
Bialczak
,
J.
Kelly
,
E.
Lucero
,
P.
O'Malley
,
M.
Mariantoni
,
D.
Sank
 et al., “
Minimizing quasiparticle generation from stray infrared light in superconducting quantum circuits
,”
Appl. Phys. Lett.
99
,
113507
(
2011
).
25.
J.
Braumüller
,
L.
Ding
,
A. P.
Vepsäläinen
,
Y.
Sung
,
M.
Kjaergaard
,
T.
Menke
,
R.
Winik
,
D.
Kim
,
B. M.
Niedzielski
,
A.
Melville
 et al., “
Characterizing and optimizing qubit coherence based on squid geometry
,”
Phys. Rev. Appl.
13
,
054079
(
2020
).
26.
J. J.
Burnett
,
A.
Bengtsson
,
M.
Scigliuzzo
,
D.
Niepce
,
M.
Kudra
,
P.
Delsing
, and
J.
Bylander
, “
Decoherence benchmarking of superconducting qubits
,”
npj Quantum Inf.
5
,
54
(
2019
).
27.
S.
Schlör
,
J.
Lisenfeld
,
C.
Müller
,
A.
Bilmes
,
A.
Schneider
,
D. P.
Pappas
,
A. V.
Ustinov
, and
M.
Weides
, “
Correlating decoherence in transmon qubits: Low frequency noise by single fluctuators
,”
Phys. Rev. Lett.
123
,
190502
(
2019
).
28.
S.
Asaad
,
C.
Dickel
,
N. K.
Langford
,
S.
Poletto
,
A.
Bruno
,
M. A.
Rol
,
D.
Deurloo
, and
L.
DiCarlo
, “
Independent, extensible control of same-frequency superconducting qubits by selective broadcasting
,”
npj Quantum Inf.
2
,
16029
(
2016
).
29.
D. C.
McKay
,
S.
Filipp
,
A.
Mezzacapo
,
E.
Magesan
,
J. M.
Chow
, and
J. M.
Gambetta
, “
Universal gate for fixed-frequency qubits via a tunable bus
,”
Phys. Rev. Appl.
6
,
064007
(
2016
).
30.
N.
Didier
,
E. A.
Sete
,
M. P.
da Silva
, and
C.
Rigetti
, “
Analytical modeling of parametrically modulated transmon qubits
,”
Phys. Rev. A
97
,
022330
(
2018
).
31.
N.
Didier
,
E. A.
Sete
,
J.
Combes
, and
M. P.
da Silva
, “
AC flux sweet spots in parametrically modulated superconducting qubits
,”
Phys. Rev. Appl.
12
,
054015
(
2019
).
32.
F.
Lecocq
,
F.
Quinlan
,
K.
Cicak
,
J.
Aumentado
,
S.
Diddams
, and
J.
Teufel
, “
Control and readout of a superconducting qubit using a photonic link
,”
Nature
591
,
575
579
(
2021
).

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