Splitting and connecting singlets in atomic quantum circuits
arXiv:2409.02984 · doi:10.1103/xh3v-tky4
Abstract
Gate operations composed in quantum circuits form the basis for digital quantum simulation and quantum processing. While two-qubit gates generally operate on nearest neighbours, many circuits require nonlocal connectivity and necessitate some form of quantum information transport. Yet, connecting distant nodes of a quantum processor still remains challenging, particularly for neutral atoms in optical lattices. Here, we create singlet pairs of two magnetic states of fermionic potassium-40 atoms in an optical lattice and use a bi-directional topological Thouless pump to transport, coherently split, and separate the pairs, as well as to demonstrate interaction between them via tuneable swap-gate operations. We achieve pumping with a single-shift fidelity of 99.78(3)% over 50 lattice sites and split the pairs within a decoherence-free subspace. Gates are implemented by superexchange interaction, allowing us to produce interwoven atomic singlets. For read-out, we apply a magnetic field gradient, resulting in single- and multi-frequency singlet-triplet oscillations. Our work shows avenues to create complex patterns of entanglement and new approaches to quantum processing, sensing, and atom interferometry.
References in corpus (23)
- Many-Body Physics with Individually-Controlled Rydberg Atoms
- Logical quantum processor based on reconfigurable atom arrays
- Single-Spin Addressing in an Atomic Mott Insulator
- Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
- Demonstration of multi-qubit entanglement and algorithms on a programmable neutral atom quantum computer
- Universal computation by multi-particle quantum walk
- Controlled exchange interaction between pairs of neutral atoms in an optical lattice
- A Race Track Trapped-Ion Quantum Processor
- Quantum computing with alkaline earth atoms
- Thouless pumping and topology
- Controlling and Detecting Spin Correlations of Ultracold Atoms in Optical lattices
- Quantisation and its breakdown in a Hubbard-Thouless pump
- Fermionic quantum processing with programmable neutral atom arrays
- Quantum Many-Body Dynamics of Coupled Double-Well Superlattices
- Continuous operation of large-scale atom arrays in optical lattices
- Digital atom interferometer with single particle control on a discretized spacetime geometry
- Low-entropy states of neutral atoms in polarization-synthesized optical lattices
- An atomic boson sampler
- Functional building blocks for scalable multipartite entanglement in optical lattices
- Interactions enable Thouless pumping in a nonsliding lattice
- Erasure-cooling, control, and hyper-entanglement of motion in optical tweezers
- Creation of resilient entangled states and a resource for measurement-based quantum computation with optical superlattices
- Reversal of quantised Hall drifts at non-interacting and interacting topological boundaries