Deterministic preparation of W states via spin-photon interactions
- URL: http://arxiv.org/abs/2105.10191v1
- Date: Fri, 21 May 2021 08:00:54 GMT
- Title: Deterministic preparation of W states via spin-photon interactions
- Authors: Fatih Ozaydin, Can Yesilyurt, Sinan Bugu, and Masato Koashi
- Abstract summary: We study deterministic preparation of arbitrary size $W$ states with spin systems.
We present an efficient operation on three qubits, two being the logical qubits and one being the ancillary qubit.
We show how to create a large scale $W$ state out of separable qubits, or double the size of a $W$ state.
- Score: 1.0499611180329804
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Spin systems such as silicon or nitrogen vacancy centers in diamond, quantum
dots and quantum dot molecules coupled to optical cavities appear as key
elements for creating quantum networks as not only constituting the nodes of
the network, but also assisting the creation of photonic networks. Here we
study deterministic preparation of arbitrary size $W$ states with spin systems.
We present an efficient operation on three qubits, two being the logical qubits
and one being the ancillary qubit, where no interaction between the logical
qubits are required. The proposed operation can create a $W$-type
Einstein-Podolsky-Rosen (EPR) pair from two separable qubits, and expand that
EPR pair or an arbitrary size $W$ state by one, creating a $W$-like state.
Taking this operation as the fundamental building block, we show how to create
a large scale $W$ state out of separable qubits, or double the size of a $W$
state. Based on this operation and focusing on nitrogen vacancy (NV) centers in
diamond as an exemplary spin system, we propose a setup for preparing $W$
states of circularly polarized photons, assisted by a single spin qubit, where
no photon-photon interactions are required. Next, we propose a setup for
preparing $W$ states of spin qubits of spatially separated systems, assisted by
a single photon. We also analyze the effects of possible imperfections in
implementing the gates on the fidelity of the generated $W$ states. In our
setups, neither post-measurement, nor post-processing on the states of spin or
photonic qubit is required. Our setups can be implemented with current
technology, and we anticipate that they contribute to quantum science and
technologies.
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