70 citations · 341 across the 21 of their papers we have counts for
19 papers · 1 filter
Interaction-Assisted Spin Coherence in a Multimode Trapped Atomic Ensemble
Aleksandre Merabishvili, Ebubechukwu O. Ilo-Okeke
In a thermally occupied multimode trapped ensemble, mode-dependent detunings can strongly suppress Ramsey contrast even when the underlying dynamics remains coherent. We develop a…
Phase assumption-free multiparty quantum clock synchronization
Hatim A. Oujaa, Qiao Liu, Ebubechukwu O. Ilo-Okeke +3
We investigate methods to broadcast timing information from a central clock to all other clocks by the use of multipartite entanglement. This task is a necessary step in establishi…
Neutral atom entangling gate in the ultrastrong coupling regime
Ebubechukwu O. Ilo-Okeke, Tongzhou Wang, Valentin Ivannikov +1
We propose a method to deterministically entangle qubits or ensembles of qubits interacting with a shared bosonic mode in the ultrastrong coupling regime. We show that the resultin…
Quantum nondemolition measurement operator with spontaneous emission
Ebubechukwu O. Ilo-Okeke, Tim Byrnes
We present a theory for quantum nondemolition (QND) measurements of an atomic ensemble in the presence of spontaneous emission. We derive the master equation that governs the evolu…
Photon loss effects on light-mediated non-Gaussian entangled Bose-Einstein condensates projecting with different photon measurement outcomes
Shuai Gao, Manish Chaudhary, Alexey N. Pyrkov +6
The theory of quantum information processing for macroscopic qubits is based on the fact that every macroscopic qubit has a conserved number of particles. However, from an experime…
Optical and atomic decoherence in entangled atomic ensembles generated by quantum nondemolition measurements
Shuai Gao, Shuang Li, Manish Chaudhary +4
We study the effects of decoherence in the form of optical phase diffusion, photon loss and gain, and atomic dephasing in entangled atomic ensembles produced via quantum nondemolit…
Macroscopic maximally entangled state preparation between two atomic ensembles
Manish Chaudhary, Ebubechukwu O. Ilo-Okeke, Valentin Ivannikov +1
We develop a scheme to prepare a macroscopic maximally entangled state (MMES) between two atomic ensembles using adaptive quantum nondemolition (QND) measurements. The quantum stat…
Measurement operator for quantum nondemolition measurements
Ebubechukwu O. Ilo-Okeke, Ping Chen, Shuang Li +3
We derive a measurement operator corresponding to a quantum nondemolition (QND) measurement of an atomic ensemble. The quantum measurement operator takes the form of a positive ope…
Imaginary time evolution with quantum nondemolition measurements: multi-qubit interactions via measurement nonlinearities
Manikandan Kondappan, Manish Chaudhary, Ebubechukwu O. Ilo-Okeke +2
We show that quantum nondemolition (QND) measurements can be used to realize measurement-based imaginary time evolution. In our proposed scheme, repeated weak QND measurements are…
Hybrid approximation approach to generation of atomic squeezing with quantum nondemolition measurements
Ebubechukwu O. Ilo-Okeke, Manikandan Kondappan, Ping Chen +3
We analyze a scheme that uses quantum nondemolition measurements to induce squeezing of a spinor Bose-Einstein condensate in a double well trap. In a previous paper [Ilo-Okeke et a…
Deterministic preparation of supersinglets with collective spin projections
Ebubechukwu O. Ilo-Okeke, Yangxu Ji, Ping Chen +5
We introduce a procedure to generate supersinglets, the multipartite generalization of angular momentum singlet states. A supersinglet is defined as a total spin zero state consist…
Measurement-based deterministic imaginary time evolution
Yuping Mao, Manish Chaudhary, Manikandan Kondappan +4
We introduce a method to perform imaginary time evolution in a controllable quantum system using measurements and conditional unitary operations. By performing a sequence of weak m…
Faraday imaging induced squeezing of a double-well Bose-Einstein condensate
Ebubechukwu O. Ilo-Okeke, Shinichi Sunami, Christopher J. Foot +1
We examine how non-destructive measurements generate spin squeezing in an atomic Bose-Einstein condensate confined in a double-well trap. The condensate in each well is monitored u…
Remote state preparation of two-component Bose-Einstein condensates
Manish Chaudhary, Matteo Fadel, Ebubechukwu O. Ilo-Okeke +3
A protocol for remote state preparation is proposed for spin ensembles, where the aim is to prepare a state with a given set of spin expectation values on a remote spin ensemble us…
Quantum Atom Optics: Theory and Applications to Quantum Technology
Tim Byrnes, Ebubechukwu O. Ilo-Okeke
This is a pre-publication version of a forthcoming book on quantum atom optics. It is written as a senior undergraduate to junior graduate level textbook, assuming knowledge of bas…
Relativity of quantum states in entanglement swapping: Violation of Bell's inequality with no entanglement
Chris Nagele, Ebubechukwu O. Ilo-Okeke, Peter P. Rohde +2
The entanglement swapping protocol is analyzed in a relativistic setting, where shortly after the entanglement swapping is performed, a Bell violation measurement is performed. Fro…
Remote quantum clock synchronization without synchronized clocks
Ebubechukwu O. Ilo-Okeke, Louis Tessler, Jonathan P. Dowling +1
A major outstanding problem for many quantum clock synchronization protocols is the hidden assumption of the availability of synchronized clocks within the protocol. In general, qu…
Macroscopic quantum information processing using spin coherent states
Tim Byrnes, Daniel Rosseau, Megha Khosla +6
Previously a new scheme of quantum information processing based on spin coherent states of two component Bose-Einstein condensates was proposed (Byrnes {\it et al.} Phys. Rev. A 85…
Geometric phase gate for entangling two Bose-Einstein condensates
Mahmood Irtiza Hussain, Ebubechukwu O. Ilo-Okeke, Tim Byrnes
We propose a method of entangling two spinor Bose-Einstein condensates using a geometric phase gate. The scheme relies upon only the ac Stark shift and a common controllable optica…