Entangling Transmons with Low-Frequency Protected Superconducting Qubits
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Entangling Transmons with Low-Frequency Protected Superconducting Qubits. / Maiani, Andrea; Kjaergaard, Morten; Schrade, Constantin.
I: PRX Quantum, Bind 3, Nr. 3, 030329, 29.08.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Entangling Transmons with Low-Frequency Protected Superconducting Qubits
AU - Maiani, Andrea
AU - Kjaergaard, Morten
AU - Schrade, Constantin
PY - 2022/8/29
Y1 - 2022/8/29
N2 - Novel qubits with intrinsic noise protection constitute a promising route for improving the coherence of quantum information in superconducting circuits. However, many protected superconducting qubits exhibit relatively low transition frequencies, which could make their integration with conventional transmon circuits challenging. In this work, we propose and study a scheme for entangling a tunable transmon with a Cooper-pair parity-protected qubit, a paradigmatic example of a low-frequency protected qubit that stores quantum information in opposite Cooper-pair parity states on a superconducting island. By tuning the external flux on the transmon, we show that noncomputational states can mediate a two-qubit entangling gate that preserves the Cooper-pair parity independent of the detailed pulse sequence. Interestingly, the entangling gate bears similarities to a controlled-phase gate in conventional transmon devices. Hence, our results suggest that standard high-precision gate calibration protocols could be repurposed for operating heterogeneous quantum processors.
AB - Novel qubits with intrinsic noise protection constitute a promising route for improving the coherence of quantum information in superconducting circuits. However, many protected superconducting qubits exhibit relatively low transition frequencies, which could make their integration with conventional transmon circuits challenging. In this work, we propose and study a scheme for entangling a tunable transmon with a Cooper-pair parity-protected qubit, a paradigmatic example of a low-frequency protected qubit that stores quantum information in opposite Cooper-pair parity states on a superconducting island. By tuning the external flux on the transmon, we show that noncomputational states can mediate a two-qubit entangling gate that preserves the Cooper-pair parity independent of the detailed pulse sequence. Interestingly, the entangling gate bears similarities to a controlled-phase gate in conventional transmon devices. Hence, our results suggest that standard high-precision gate calibration protocols could be repurposed for operating heterogeneous quantum processors.
U2 - 10.1103/PRXQuantum.3.030329
DO - 10.1103/PRXQuantum.3.030329
M3 - Journal article
VL - 3
JO - PRX Quantum
JF - PRX Quantum
SN - 2691-3399
IS - 3
M1 - 030329
ER -
ID: 319153291