TY - JOUR
T1 - Simple implementation of high fidelity controlled- iswap gates and quantum circuit exponentiation of non-Hermitian gates
AU - Rasmussen, Stig Elkjær
AU - Zinner, Nikolaj Thomas
PY - 2020/7
Y1 - 2020/7
N2 - The iswap gate is an entangling swapping gate where the qubits obtain a phase of i if the state of the qubits is swapped. Here we present a simple implementation of the controlled-iswap gate. The gate can be implemented with several controls and works by applying a single flux pulse. The gate time is independent of the number of controls, and we find high fidelities for any number of controls. We discuss an implementation of the gates using superconducting circuits and present a realistic implementation proposal, where we have taken decoherence noise and fabrication errors on the superconducting chip in to account, by Monte Carlo simulating possible errors. The general idea presented in this paper is, however, not limited to such implementations. Exponentiation of quantum gates is desired in some quantum information schemes and we therefore also present a quantum circuit for probabilistic exponentiating the iswap gate and other non-Hermitian gates.
AB - The iswap gate is an entangling swapping gate where the qubits obtain a phase of i if the state of the qubits is swapped. Here we present a simple implementation of the controlled-iswap gate. The gate can be implemented with several controls and works by applying a single flux pulse. The gate time is independent of the number of controls, and we find high fidelities for any number of controls. We discuss an implementation of the gates using superconducting circuits and present a realistic implementation proposal, where we have taken decoherence noise and fabrication errors on the superconducting chip in to account, by Monte Carlo simulating possible errors. The general idea presented in this paper is, however, not limited to such implementations. Exponentiation of quantum gates is desired in some quantum information schemes and we therefore also present a quantum circuit for probabilistic exponentiating the iswap gate and other non-Hermitian gates.
UR - http://www.scopus.com/inward/record.url?scp=85102539355&partnerID=8YFLogxK
U2 - 10.1103/PhysRevResearch.2.033097
DO - 10.1103/PhysRevResearch.2.033097
M3 - Journal article
SN - 2643-1564
VL - 2
JO - Physical Review Research
JF - Physical Review Research
IS - 3
M1 - 033097
ER -