Symmetric Finite-Time Preparation of Cluster States via Quantum Pumps
- URL: http://arxiv.org/abs/2107.04019v2
- Date: Mon, 22 Aug 2022 23:36:49 GMT
- Title: Symmetric Finite-Time Preparation of Cluster States via Quantum Pumps
- Authors: Nathanan Tantivasadakarn, Ashvin Vishwanath
- Abstract summary: We show that it is possible to prepare cluster-like states in finite time without breaking the symmetry protecting the resource state.
We show that even if unwanted symmetric perturbations are present in the driving Hamiltonian, projective measurements in the bulk along with feedforward correction is sufficient to recover a cluster-like state.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: It has recently been established that cluster-like states -- states that are
in the same symmetry-protected topological phase as the cluster state --
provide a family of resource states that can be utilized for Measurement-Based
Quantum Computation. In this work, we ask whether it is possible to prepare
cluster-like states in finite time without breaking the symmetry protecting the
resource state. Such a symmetry-preserving protocol would benefit from
topological protection to errors in the preparation. We answer this question in
the positive by providing a Hamiltonian in one higher dimension whose
finite-time evolution is a unitary that acts trivially in the bulk, but pumps
the desired cluster state to the boundary. Examples are given for both the 1D
cluster state protected by a global symmetry, and various 2D cluster states
protected by subsystem symmetries. We show that even if unwanted symmetric
perturbations are present in the driving Hamiltonian, projective measurements
in the bulk along with feedforward correction is sufficient to recover a
cluster-like state.
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