All-Microwave Leakage Reduction Units for Quantum Error Correction with Superconducting Transmon Qubits
J.M. Ferreira Marques (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft)
H.A.S. Ali (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
B. M. Varbanov (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Terhal Group)
M. Finkel (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab)
H. M. Veen (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
S. L.M. Van Der Meer (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
S. Valles-Sanclemente (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
N. Muthusubramanian (TU Delft - Applied Sciences, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
M. Beekman (TU Delft - BUS/TNO STAFF, TU Delft - QuTech Advanced Research Centre)
N. Haider (TU Delft - BUS/TNO STAFF, TU Delft - QuTech Advanced Research Centre)
B. M. Terhal (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Terhal Group, TU Delft - Electrical Engineering, Mathematics and Computer Science)
L. Dicarlo (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab, TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)
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Abstract
Minimizing leakage from computational states is a challenge when using many-level systems like superconducting quantum circuits as qubits. We realize and extend the quantum-hardware-efficient, all-microwave leakage reduction unit (LRU) for transmons in a circuit QED architecture proposed by Battistel et al. This LRU effectively reduces leakage in the second- and third-excited transmon states with up to 99% efficacy in 220 ns, with minimum impact on the qubit subspace. As a first application in the context of quantum error correction, we show how multiple simultaneous LRUs can reduce the error detection rate and suppress leakage buildup within 1% in data and ancilla qubits over 50 cycles of a weight-2 stabilizer measurement.