US 12,614,097 B2Granted

Methods and systems for high-fidelity ZZ-rotation of qubits

AssigneeQEDMA Quantum Computing LTD.

InventorsIlya Gurwich, Itsik Cohen, Ron Melcer, Shlomi Kotler

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Abstract

A method for performing a ZZ-rotation quantum gate acting on two qubits having an XX coupling and corresponding resonance frequencies. The method includes applying twice the following pulses: rotation pulses, and echo pulses. In each application of pulses, to each of the two qubits, a corresponding rotation pulse is applied. The rotation pulse has a corresponding phase, has a corresponding amplitude, and has a driving frequency ω{circumflex over ( )}((i)) distinct from each of the resonance frequencies, so that each of the two qubits is having a corresponding detuning Δ_0,1{circumflex over ( )}(i)). The echo pulse is commuting with a Pauli-ZZ operator associated with the two qubits. The echo pulse is applied so as to control a magnitude of any one of: XX+θ(Δ_0{circumflex over ( )}((i)) Δ_1{circumflex over ( )}((i)))·YY rotation, and XY-θ(Δ_0{circumflex over ( )}((i)) Δ_1{circumflex over ( )}((i)))·YX rotation. In each application of pulses, the echo pulse is applied after the rotation pulse.

Claims20

Dependent claims

A method for performing a ZZ-rotation quantum gate acting on two qubits Q0,1 having an XX coupling, each of said two qubits having a corresponding resonance frequency ω0,1, the method comprising applying twice:

(a) to each of said two qubits, a corresponding rotation pulse having:
i) a driving frequency ω(i) distinct from each of said resonance frequencies ω0,1, so that each of said two qubits is having a corresponding detuning
Δ
0
,
1
(
i
)
=
ω
(
i
)
-
ω
0
,
1
;
ii) a corresponding amplitude Ω0,1(i), so that each of said two qubits having a corresponding effective frequency
Ω
_
0
,
1
(
i
)
⁢
being
⁢
Ω
_
0
,
1
(
i
)
=
θ
⁡
(
Δ
0
,
1
(
i
)
)
·
Δ
0
,
1
(
i
)
⁢
2
+
Ω
0
,
1
(
i
)
⁢
2
,
wherein θ(x) being the sign function;
iii) a corresponding phase
ϕ
0
,
1
(
i
)
;
thereby, each rotation pulse having a Hamiltonian
H
p
=
Ω
0
,
1
(
i
)
⁢
X
^
0
,
1
⁢
cos
⁡
(
ω
(
i
)
⁢
t
+
ϕ
0
,
1
(
i
)
)
,
wherein {circumflex over (X)}0,1 being a corresponding Pauli-X operator;
(b) an echo pulse commuting with a Pauli-ZZ operator associated with said two qubits, so as to control a magnitude of any one of:
XX
+
θ
⁡
(
Δ
0
(
i
)
⁢
Δ
1
(
i
)
)
·
YY
⁢
rotation
,
and
⁢
⁢
XY
-
θ
⁡
(
Δ
0
(
i
)
⁢
Δ
1
(
i
)
)
·
YX
⁢
rotation
,
wherein said echo pulse is applied after said rotation pulse;
wherein each application (i) of said rotation pulses is associated with a corresponding set of driving frequency ω(i), amplitudes
Ω
0
,
1
(
i
)
and phases
ϕ
0
,
1
(
i
)
.

184 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/343,480Filed 29 Sep 2025 · us provisional application
Priority: 30 Sep 2024
Published: US 2026/0094037 A12 Apr 2026
Granted: 28 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G06N 10/20
Quantum computing, i.e. information processing based on quantum-mechanical phenomena: models of quantum computing, e.g. quantum circuits or…
G06N 10/40
Quantum computing, i.e. information processing based on quantum-mechanical phenomena: physical realisations or architectures of quantum processors…
G06N 10/70
Quantum computing, i.e. information processing based on quantum-mechanical phenomena: quantum error correction, detection or prevention, e.g.…
G06N
AI and machine learning