Macroscopic maximally entangled state preparation between two atomic ensembles

• URL: http://arxiv.org/abs/2302.07526v2
• Date: Thu, 14 Sep 2023 11:56:17 GMT
• Title: Macroscopic maximally entangled state preparation between two atomic ensembles
• Authors: Manish Chaudhary, Ebubechukwu O. Ilo-Okeke, Valentin Ivannikov and Tim Byrnes
• Abstract summary: We prepare a macroscopic maximally entangled state (MMES) between two atomic ensembles using adaptive quantum nondemolition (QND) measurements. The quantum state of the system is evolved using a sequence of QND measurements followed by adaptive unitaries.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We develop a scheme to prepare a macroscopic maximally entangled state (MMES) between two atomic ensembles using adaptive quantum nondemolition (QND) measurements. The quantum state of the system is evolved using a sequence of QND measurements followed by adaptive unitaries, such that the desired measurement outcome is obtained with asymptotically unit probability. This procedure is repeated in z and x spin basis alternately such that the state converges deterministically towards the maximally entangled state. Up to a local spin-basis rotation, the maximally entangled state has zero total spin angular momentum, i.e. it is a singlet state. Our protocol does not perform postselection and works beyond the Holstein-Primakoff regime for the atomic spin degrees of freedom, producing genuine macroscopic entanglement.

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