Quantum gates with weak van der Waals interactions of neutral Rydberg atoms

• URL: http://arxiv.org/abs/2212.06316v1
• Date: Tue, 13 Dec 2022 01:55:03 GMT
• Title: Quantum gates with weak van der Waals interactions of neutral Rydberg atoms
• Authors: Xiao-Feng Shi and Yan Lu
• Abstract summary: We study a controlled-phase gate with an arbitrary phase and extend it to the controlled-NOT gate. The gates need only three steps for coupling one Rydberg state. They can work with very weak interactions so that well-separated qubits can be entangled.
• Score: 18.24045230829502
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Neutral atoms are promising for large-scale quantum computing, but accurate neutral-atom entanglement depends on large Rydberg interactions which strongly limit the interatomic distances. Via a phase accumulation in detuned Rabi cycles enabled by a Rydberg interaction of similar magnitude to the Rydberg Rabi frequency, we study a controlled-phase gate with an arbitrary phase and extend it to the controlled-NOT gate. The gates need only three steps for coupling one Rydberg state, depend on easily accessible van der Waals interaction that naturally arises between distant atoms, and have no rotation error in the weak interaction regime. Importantly, they can work with very weak interactions so that well-separated qubits can be entangled. The gates are sensitive to the irremovable fluctuation of Rydberg interactions, but can still have a fidelity over 98\% with realistic position fluctuation of qubits separated over 20~$\mu$m.

Related papers

• Quantum gates between distant atoms mediated by a Rydberg excitation antiferromagnet [0.0]
  We present a novel protocol to implement quantum gates between distant atomic qubits connected by an array of neutral atoms. The protocol is based on adiabatically transferring the atoms in the array to an antiferromagnetic-like state of Rydberg excitations using chirped laser pulses.
  arXiv  Detail & Related papers  (2024-08-21T11:44:09Z)
• Extended two-body Rydberg blockade interaction with off-resonant modulated driving [2.609952801475146]
  We introduce extra buffer atom to extend two-qubit Rydberg blockade gate. The buffer atom couples with the two qubit atoms which do not directly exert any physical influence on each other. These efforts bring the cold atom qubit platform closer to the notions of wires and junctions in solid state electronics.
  arXiv  Detail & Related papers  (2023-11-28T01:44:09Z)
• Entanglement statistics of randomly interacting spins [62.997667081978825]
  Entanglement depends on the underlying topology of the interaction among the qubits. We investigate the entanglement in the ground state of systems comprising two and three qubits with random interactions.
  arXiv  Detail & Related papers  (2023-07-18T23:58:32Z)
• Bound state of distant photons in waveguide quantum electrodynamics [137.6408511310322]
  Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. We predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Such states could be realized in the waveguide quantum electrodynamics platform.
  arXiv  Detail & Related papers  (2023-03-17T09:27:02Z)
• Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule [52.77024349608834]
  We demonstrate Rydberg blockade due to the charge-dipole interaction between a single Rb atom and a single RbCs molecule confined in optical tweezers. Results open up the prospect of a hybrid platform where quantum information is transferred between individually trapped molecules using Rydberg atoms.
  arXiv  Detail & Related papers  (2023-03-10T18:41:20Z)
• Phase diagram of Rydberg-dressed atoms on two-leg triangular ladders [50.591267188664666]
  We investigate the phase diagram of hard-core bosons in a triangular ladder with next-to-nearest-neighbor interaction along each leg. For weak interactions, Abelian bosonization predicts a spin density wave and a fully gapless Luttinger liquid phase. The competition with the zigzag interaction generates a charge density wave, a 'polarized holonic' phase, and a crystalline phase at the filling 2/5.
  arXiv  Detail & Related papers  (2022-07-01T12:49:04Z)
• Formation of robust bound states of interacting microwave photons [148.37607455646454]
  One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
  arXiv  Detail & Related papers  (2022-06-10T17:52:29Z)
• Anderson localization of a Rydberg electron [68.8204255655161]
  Rydberg atoms inherit their level structure, symmetries, and scaling behavior from the hydrogen atom. limit is reached by simultaneously increasing the number of ground state atoms and the level of excitation of the Rydberg atom.
  arXiv  Detail & Related papers  (2021-11-19T18:01:24Z)
• Electron cloud design for Rydberg multi-qubit gates [0.0]
  This article proposes quantum processing in an optical lattice, using Rydberg electron's Fermi scattering from ground-state atoms. The interaction is controlled by engineering the electron cloud of a sole Rydberg atom. The features in the new scheme are of special interest for the implementation of quantum optimization and error correction algorithms.
  arXiv  Detail & Related papers  (2021-11-02T13:17:10Z)
• Realizing distance-selective interactions in a Rydberg-dressed atom array [0.0]
  Measurement-based quantum computing relies on the rapid creation of large-scale entanglement in a register of stable qubits. Rydberg states are well suited to store quantum information, and entanglement can be created using highly-excited Rydberg states. Here, we engineer distance-selective interactions that are strongly peaked in distance through off-resonant laser coupling of molecular potentials between Rydberg atom pairs.
  arXiv  Detail & Related papers  (2021-10-19T17:39:48Z)
• Transition Slow-Down by Rydberg Interaction of Neutral Atoms and a Fast Controlled-NOT Quantum Gate [4.394728504061752]
  We study an effect of the Rydberg blockade, namely, the transition slow-down(TSD) In TSD, a ground-Rydberg cycling in one atom slows down a Rydberg-involved state transition of a nearby atom, which is in contrast to EA that annihilates a presumed state transition. The speedy and accurate TSD-based footnotesize CNOT makes neutral atoms comparable(superior) to superconducting(ion-trap) systems.
  arXiv  Detail & Related papers  (2021-01-31T00:13:54Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.