Superconducting circuit protected by two-Cooper-pair tunneling
W. C. Smith, A. Kou, X. Xiao, U. Vool, M. H. Devoret
Abstract
Abstract We present a protected superconducting qubit based on an effective circuit element that only allows pairs of Cooper pairs to tunnel. These dynamics give rise to a nearly degenerate ground state manifold indexed by the parity of tunneled Cooper pairs. We show that, when the circuit element is shunted by a large capacitance, this manifold can be used as a logical qubit that we expect to be insensitive to multiple relaxation and dephasing mechanisms.
Topics & Concepts
DephasingCooper pairPhysicsQuantum tunnellingQubitDegenerate energy levelsPhase qubitSuperconductivityCharge qubitElement (criminal law)Quantum mechanicsCondensed matter physicsGround stateTopology (electrical circuits)Relaxation (psychology)Parity (physics)Flux qubitElectronic circuitState (computer science)Manifold (fluid mechanics)Electrical elementQuantum computerQuantum and electron transport phenomenaQuantum Information and CryptographyTopological Materials and Phenomena