Simple operation sequences to couple and interchange quantum information between spin qubits of different kinds

Abstract

Efficient operation sequences to couple and interchange quantum information between quantum dot spin qubits of different kinds are derived using exchange interactions. In the qubit encoding of a single-spin qubit, a singlet-triplet qubit, and an exchange-only (triple-dot) qubit, some of the single-qubit interactions remain on during the entangling operation; this greatly simplifies the operation sequences that construct entangling operations. In the ideal setup, the gate operations use the intra-qubit exchange interactions only once. The limitations of the entangling sequences are discussed, and it is shown how quantum information can be converted between different kinds of quantum dot spin qubits.

9 pages, 4 figures

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Cited by in corpus (10)

• Quantum nondemolition measurement of an electron spin qubit
• Charge-noise-insensitive gate operations for always-on, exchange-only qubits
• A fast quantum interface between different spin qubit encodings
• Quantum-limited measurement of spin qubits via curvature coupling to a cavity
• Anisotropy-Exchange Resonance as a Mechanism for Entangled State Switching
• Generation of Schrödinger's cat states in a planar semiconductor heterostructure
• Controlled-NOT gate sequences for mixed spin qubit architectures in a noisy environment
• Electronic control and switching of entangled spin state using anisotropy and exchange in the three-particle paradigm
• All-electric single electron spin-to-charge conversion
• Comparison of spin-qubit architectures for quantum error-correcting codes