Heralded quantum entangling gate for distributed quantum computation in a decoherence-free subspace

• URL: http://arxiv.org/abs/2305.00642v1
• Date: Mon, 1 May 2023 03:19:07 GMT
• Title: Heralded quantum entangling gate for distributed quantum computation in a decoherence-free subspace
• Authors: Wanhua Su, Wei Qin, Adam Miranowicz, Tao Li, and Franco Nori
• Abstract summary: We propose a heralded nonlocal protocol for implementing an entangling gate on two stationary qubits coupled to spatially separated cavities. By dynamically controlling the evolution of the composite system, the entangling gate can be achieved without real excitations of cavity modes nor atoms.
• Score: 3.711307820430257
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a heralded nonlocal protocol for implementing an entangling gate on two stationary qubits coupled to spatially separated cavities. By dynamically controlling the evolution of the composite system, the entangling gate can be achieved without real excitations of cavity modes nor atoms. The success of our protocol is conditioned on projecting an auxiliary atom onto a postselected state, which simultaneously removes various detrimental effects of dissipation on the gate fidelity. In principle, the success probability of the gate can approach unity as the single-atom cooperativity becomes sufficiently large. Furthermore, we show its application for implementing single- and two-qubit gates within a decoherence-free subspace that is immune to a collective dephasing noise. This heralded, faithful, and nonlocal entangling gate protocol can, therefore, be useful for distributed quantum computation and scalable quantum networks.

Related papers

• Quantum process tomography of continuous-variable gates using coherent states [49.299443295581064]
  We demonstrate the use of coherent-state quantum process tomography (csQPT) for a bosonic-mode superconducting circuit. We show results for this method by characterizing a logical quantum gate constructed using displacement and SNAP operations on an encoded qubit.
  arXiv  Detail & Related papers  (2023-03-02T18:08:08Z)
• A Multi-Qubit Quantum Gate Using the Zeno Effect [3.0660488697958734]
  We show that a measurement can turn a non-interacting system with only single-qubit control into a two- or multi-qubit entangling gate. The gate works by a geometric phase on the system, conditioned on it lying within a particular nonlocal subspace. We show that the gate is viable for implementation in circuit and cavity QED systems.
  arXiv  Detail & Related papers  (2022-11-11T03:54:21Z)
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
  We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
  arXiv  Detail & Related papers  (2022-09-06T18:18:41Z)
• Fast and Robust Geometric Two-Qubit Gates for Superconducting Qubits and beyond [0.0]
  We propose a scheme to realize robust geometric two-qubit gates in multi-level qubit systems. Our scheme is substantially simpler than STIRAP-based gates that have been proposed for atomic platforms. We show how our gate can be accelerated using a shortcuts-to-adiabaticity approach.
  arXiv  Detail & Related papers  (2022-08-08T16:22:24Z)
• Software mitigation of coherent two-qubit gate errors [55.878249096379804]
  Two-qubit gates are important components of quantum computing. But unwanted interactions between qubits (so-called parasitic gates) can degrade the performance of quantum applications. We present two software methods to mitigate parasitic two-qubit gate errors.
  arXiv  Detail & Related papers  (2021-11-08T17:37:27Z)
• Robust Nonadiabatic Holonomic Quantum Gates on Decoherence-Protected Qubits [4.18804572788063]
  We propose a scheme for quantum manipulation by combining the geometric phase approach with the dynamical correction technique. Our scheme is implemented on the superconducting circuits, which also simplifies previous implementations.
  arXiv  Detail & Related papers  (2021-10-06T14:39:52Z)
• Quantum simulation of $\phi^4$ theories in qudit systems [53.122045119395594]
  We discuss the implementation of quantum algorithms for lattice $Phi4$ theory on circuit quantum electrodynamics (cQED) system. The main advantage of qudit systems is that its multi-level characteristic allows the field interaction to be implemented only with diagonal single-qudit gates.
  arXiv  Detail & Related papers  (2021-08-30T16:30:33Z)
• Quantum communication complexity beyond Bell nonlocality [87.70068711362255]
  Efficient distributed computing offers a scalable strategy for solving resource-demanding tasks. Quantum resources are well-suited to this task, offering clear strategies that can outperform classical counterparts. We prove that a new class of communication complexity tasks can be associated to Bell-like inequalities.
  arXiv  Detail & Related papers  (2021-06-11T18:00:09Z)
• Noncyclic Geometric Quantum Gates with Smooth Paths via Invariant-based Shortcuts [4.354697470999286]
  We propose a scheme to realize geometric quantum gates with noncyclic and nonadiabatic evolution via invariant-based shortcuts. Our scheme provides a promising way to realize high-fidelity fault-tolerant quantum gates for scalable quantum computation.
  arXiv  Detail & Related papers  (2021-02-01T15:05:29Z)
• Representation matching for delegated quantum computing [64.67104066707309]
  representation matching is a generic probabilistic protocol for reducing the cost of quantum computation in a quantum network. We show that the representation matching protocol is capable of reducing the communication or memory cost to almost minimum in various tasks.
  arXiv  Detail & Related papers  (2020-09-14T18:07:43Z)
• A proposal for the implementation of quantum gates in an optomechanical system via phonon blockade [0.0]
  We propose a scheme to implement quantum controlled NOT gate and quantum phase gate in an optomechanical system based on phonon blockade. For appropriate choices of system parameters, fidelities of both the quantum gate operations are very close to unity in the absence of dissipation.
  arXiv  Detail & Related papers  (2020-01-08T06:59:52Z)

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.