Entangling non planar molecules via inversion doublet transition with negligible spontaneous emission

Abstract

We analyze theoretically the entanglement between two non-planar and light identical molecules (e.g., pyramidal as $N{H}_3$) that present inversion doubling due to the internal spatial inversion of their nuclear conformations by tunneling. The peculiarity of this system lies in the simplicity of this type of molecular system in which two near levels can be connected by allowed electric dipole transition with considerable value of the dipole moment transition and negligible spontaneous emission because the transition is in the microwave or far-infrared range. These properties give place to entanglement states oscillating by free evolution with frequency determined by the dipole-dipole interaction and negligible spontaneous decay, which allows to consider an efficient quantum Zeno effect by frequent measurements of one of the entangled states. If the molecules are initially both in the upper (or lower) eigenstate, the system evolves under an external radiation field, which can induce oscillations of the generated entangled states, with frequency of the order of the Rabi frequency of the field. For a certain detuning, a symmetric entangled state, eigenstate of the collective system can be populated, and given its negligible spontaneous emission, could be maintained for a time only limited by external decoherence processes which could be minimized. Although the data used are those of the $N{H}_3$ molecule, other molecules could present the same advantageous features.

10 pages, 6 figures

References in corpus (25)

• Quantum entanglement
• Quantum Cryptography
• Entanglement of Formation of an Arbitrary State of Two Qubits
• Entanglement of a Pair of Quantum Bits
• The Physical Implementation of Quantum Computation
• Cold and Ultracold Molecules: Science, Technology, and Applications
• From Classical to Quantum Shannon Theory
• Dark periods and revivals of entanglement in a two qubit system
• Molecules cooled below the Doppler limit
• Quantum Zeno dynamics: mathematical and physical aspects
• Control of decoherence: analysis and comparison of three different strategies
• Entangling two atoms via spontaneous emission
• Second-Scale Nuclear Spin Coherence Time of Trapped Ultracold ${}^{23}$Na${}^{40}$K Molecules
• Prospects for Quantum Computing with an Array of Ultracold Polar Paramagnetic Molecules
• Controlling Polar Molecules in Optical Lattices
• Entanglement of polar symmetric top molecules as candidate qubits
• Entanglement of polar molecules in pendular states
• Quantum phase gate and controlled entanglement with polar molecules
• Coherent excitation-energy transfer and quantum entanglement in a dimer
• Interaction induced localization in a gas of pyramidal molecules
• On the observation of field-free orientation of a symmetric top molecule by terahertz laser pulses at high temperature
• Entanglement Switch for Dipole Arrays
• Quantum entanglement and disentanglement of multi-atom systems
• Measurement-induced two-qubit entanglement in a bad cavity: Fundamental and practical considerations
• Consistent histories for tunneling molecules subject to collisional decoherence