Quantum gates between distant atoms mediated by a Rydberg excitation antiferromagnet

• URL: http://arxiv.org/abs/2408.11542v1
• Date: Wed, 21 Aug 2024 11:44:09 GMT
• Title: Quantum gates between distant atoms mediated by a Rydberg excitation antiferromagnet
• Authors: Georgios Doultsinos, David Petrosyan,
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a novel protocol to implement quantum gates between distant atomic qubits connected by an array of neutral atoms playing the role of a quantum bus. The protocol is based on adiabatically transferring the atoms in the array to an antiferromagnetic-like state of Rydberg excitations using chirped laser pulses. Upon exciting and de-exciting the atoms in the array under the blockage of nearest neighbors, depending on the state of the two qubits, the system acquires a conditional geometric $\pi$-phase, while the dynamical phase cancels exactly, even when the atomic positions are disordered but nearly frozen in time, which requires sufficiently low temperatures. For van der Waals interacting atoms, under the optimal parameters of the pulses minimizing the Rydberg-state decay and non-adiabatic errors, the gate infidelity scales with the distance $L$ and the number of atoms $N$ between the qubits as $\sim L^6/N^3$. Hence, increasing the number of atoms in the quantum bus connecting the qubits at a given spatial separation will lead to higher gate fidelity.

Related papers

• Fast entangling gates for Rydberg atoms via resonant dipole-dipole interaction [0.0]
  We introduce a novel scheme for entangling gates using four atomic levels per atom: a ground state qubit and two Rydberg states. We show that this interaction can mediate controlled-Z gates that are faster and less sensitive to Rydberg decay than state-of-the-art Rydberg gates.
  arXiv  Detail & Related papers  (2024-11-07T19:00:08Z)
• Coherence Preserving Leakage Detection and Cooling in Alkaline Earth Atoms [0.0]
  Quantum nondemolition (QND) processes are made possible by encoding quantum information in the nuclear spin of alkaline earth-like atoms. These advances could significantly improve the prospect of neutral atoms for fault-tolerant quantum computation.
  arXiv  Detail & Related papers  (2024-10-30T20:17:19Z)
• Realizing fracton order from long-range quantum entanglement in programmable Rydberg atom arrays [45.19832622389592]
  Storing quantum information requires battling quantum decoherence, which results in a loss of information over time. To achieve error-resistant quantum memory, one would like to store the information in a quantum superposition of degenerate states engineered in such a way that local sources of noise cannot change one state into another. We show that this platform also allows to detect and correct certain types of errors en route to the goal of true error-resistant quantum memory.
  arXiv  Detail & Related papers  (2024-07-08T12:46:08Z)
• High-fidelity parallel entangling gates on a neutral atom quantum computer [41.74498230885008]
  We report the realization of two-qubit entangling gates with 99.5% fidelity on up to 60 atoms in parallel. These advances lay the groundwork for large-scale implementation of quantum algorithms, error-corrected circuits, and digital simulations.
  arXiv  Detail & Related papers  (2023-04-11T18:00:04Z)
• 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)
• An electrically-driven single-atom `flip-flop' qubit [43.55994393060723]
  Quantum information is encoded in the electron-nuclear states of a phosphorus donor. Results pave the way to the construction of solid-state quantum processors.
  arXiv  Detail & Related papers  (2022-02-09T13:05:12Z)
• Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale [0.0]
  We observe an interaction-driven energy exchange occuring in a timescale of nanoseconds, two orders of magnitude faster than in any previous work with Rydberg atoms. This opens the path for quantum simulation and computation operating at the speed-limit set by dipole-dipole interactions with this ultrafast Rydberg platform.
  arXiv  Detail & Related papers  (2021-11-24T07:56:52Z)
• Entanglement between a telecom photon and an on-demand multimode solid-state quantum memory [52.77024349608834]
  We show the first demonstration of entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory. We extend the entanglement storage in the quantum memory for up to 47.7$mu$s, which could allow for the distribution of entanglement between quantum nodes separated by distances of up to 10 km.
  arXiv  Detail & Related papers  (2021-06-09T13:59:26Z)
• Quantum Computing with Circular Rydberg Atoms [0.0]
  We propose a novel approach to Rydberg atom arrays using long-lived circular Rydberg states in optical traps. We project that arrays of hundreds of circular Rydberg atoms with two-qubit gate errors around $10-5$ can be realized using current technology.
  arXiv  Detail & Related papers  (2021-03-23T18:00:00Z)
• Quantum chaos driven by long-range waveguide-mediated interactions [125.99533416395765]
  We study theoretically quantum states of a pair of photons interacting with a finite periodic array of two-level atoms in a waveguide. Our calculation reveals two-polariton eigenstates that have a highly irregular wave-function in real space.
  arXiv  Detail & Related papers  (2020-11-24T07:06:36Z)
• Fast universal two-qubit gate for neutral fermionic atoms in optical tweezers [0.0]
  We present a method to perform a fast universal square-root-SWAP gate with fermionic atoms. We prove analytically that in the limit of broad atomic wave-packets, the fidelity of the gate approaches unity. A gate with such features is an important milestone towards all-to-all connectivity and fault tolerance in quantum computation with neutral atoms.
  arXiv  Detail & Related papers  (2020-08-22T12:01:31Z)

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.