Entanglement dynamics of Nitrogen-vacancy centers spin ensembles coupled to a superconducting resonator

Liu, Yimin; You, Jia-Bin; Hou, Qizhe

doi:10.1038/srep21775

Cited by 19 publications

(11 citation statements)

References 77 publications

(95 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the next challenge along this line is to embed molecular spins in a circuit Quantum-Electrodynamics (Circuit-QED) architectures 31–33 . This may provide the possibility to realize hybrid quantum memories 34 and to investigate the generation of macroscopic entanglement 35 with molecular spin systems.…”

Section: Introductionmentioning

confidence: 99%

Coherent coupling between Vanadyl Phthalocyanine spin ensemble and microwave photons: towards integration of molecular spin qubits into quantum circuits

Bonizzoni

Ghirri

Atzori

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Electron spins are ideal two-level systems that may couple with microwave photons so that, under specific conditions, coherent spin-photon states can be realized. This represents a fundamental step for the transfer and the manipulation of quantum information. Along with spin impurities in solids, molecular spins in concentrated phases have recently shown coherent dynamics under microwave stimuli. Here we show that it is possible to obtain high cooperativity regime between a molecular Vanadyl Phthalocyanine (VOPc) spin ensemble and a high quality factor superconducting YBa2Cu3O7 (YBCO) coplanar resonator at 0.5 K. This demonstrates that molecular spin centers can be successfully integrated in hybrid quantum devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Coherent coupling between Vanadyl Phthalocyanine spin ensemble and microwave photons: towards integration of molecular spin qubits into quantum circuits

Bonizzoni

Ghirri

Atzori

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This decreases to almost 0 at 1400 steps. The results of our circuit simulation are related to results obtained in both theoretical and experimental investigations of similar circuits [47][48][49] .…”

mentioning

confidence: 53%

Experimental simulation of hybrid quantum systems and entanglement on a quantum computer

Mazhandu

Mathieson

Coleman

et al. 2019

Applied Physics Letters

View full text Add to dashboard Cite

We propose the utilization of the IBM Quantum Experience quantum computing system to simulate different scenarios involving common hybrid quantum system components, the Nitrogen Vacancy Centre (NV centre) and the Flux Qubit. We perform a series of the simulation experiments and demonstrate properties of a virtual hybrid system, including its spin relaxation rate and state coherence. In correspondence with experimental investigations we look at the scalability of such systems and show that increasing the number of coupled NV centres decreases the coherence time. We also establish the main error rate as a function of the number of control pulses in evaluating the fidelity of the four qubit virtual circuit with the simulator. Our results show that the virtual system can attain decoherence and fidelity values comparable to what has been reported for experimental investigations of similar physical hybrid systems, observing a coherence time at 0.35 s for a single NV centre qubit and fidelity in the range of 0.82. The work thus establishes an effective simulation test protocol for different technologies to test and analyze them before experimental investigations or as a supplementary measure.Quantum computers have the potential to solve problems that scale up at polynomial time and are thus predicted to outperform classical computers in a wide range of tasks including machine learning 1 , complex simulations 2-14 and optimization problems 15 . However, to establish true quantum supremacy, there is a need to build and demonstrate universal fault tolerant and scalable computing systems that can extend beyond the capabilities of classical computational systems 16 . To accomplish this several different types of systems and architectures have been proposed and continue to be studied. More recently this has included the demonstration of hybrid systems which combine different complementary quantum device elements, often coupling a combination of a superconducting, atomic and or spin systems into a single circuit 17,18 . NV centres have been studied extensively for this purpose, this is because the spin states associated with the NV centre present a well-studied energy level splitting which can be readily accessed and addressed through both electrical and optical measurement techniques and are thus able to couple relatively easily to circuitry and other device components. It has already been shown that coupled NV centres and flux qubits 19,20 are ideal complimentary elements for such hybrid systems. As both these device elements rely on spin they can easily be coupled, and experimental investigations have demonstrated quantum information transfer between flux qubit and NV centre ensembles 19 . Additionally, NV centres present ideal quantum logic elements and have shown to be useful for a range of operations including as quantum registers and as quantum gates 21,22 . Due to their possibility of realizing fault tolerant logic operations holonomic quantum gates have been widely studied in various systems 21-27 but most notably wit...

show abstract

“…Experimental advances in fabrication and characterization of a nano-electromechanical systems (NEMS), quantum opto-electromechanics, cavity quantum electrodynamics gave further impetus to the fields of quantum computation and quantum hybrid systems. NEMS as hybrid systems are important for quantum information transfer, and to facilitate entanglement 28 , and also serve for studying fundamental questions at the quantum-classical boundaries. Key features of NEMS are the high Q-factors, low masses and the high frequency of the mechanical oscillations (of the order of Gigahertz (GHz)) 29 .…”

Section: Introductionmentioning

confidence: 99%

Generation of coherence in an exactly solvable nonlinear nanomechanical system

et al. 2020

View full text Add to dashboard Cite

This study is focused on the quantum dynamics of a nitrogen-vacancy (NV) center coupled to a nonlinear, periodically driven mechanical oscillator. For a continuous periodic driving that depends on the position of the oscillator, the mechanical motion is described by Mathieu elliptic functions. This solution is employed to study the dynamics of the quantum spin system including environmental effects and to evaluate the purity and the von Neumann entropy of the NV-spin. The unitary generation of coherence is addressed. We observe that the production of coherence through a unitary transformation depends on whether the system is prepared initially in mixed state. Production of coherence is efficient when the system initially is prepared in the region of the separatrix (i.e., the region where classical systems exhibit dynamical chaos). From the theory of dynamical chaos, we know that phase trajectories of the system passing through the homoclinic tangle have limited memory, and therefore the information about the initial conditions is lost. We proved that quantum chaos and diminishing of information about the mixed initial state favors the generation of quantum coherence through the unitary evolution. We introduced quantum distance from the homoclinic tangle and proved that for the initial states permitting efficient generation of coherence, this distance is minimal.

show abstract

Entanglement dynamics of Nitrogen-vacancy centers spin ensembles coupled to a superconducting resonator

Cited by 19 publications

References 77 publications

Coherent coupling between Vanadyl Phthalocyanine spin ensemble and microwave photons: towards integration of molecular spin qubits into quantum circuits

Coherent coupling between Vanadyl Phthalocyanine spin ensemble and microwave photons: towards integration of molecular spin qubits into quantum circuits

Experimental simulation of hybrid quantum systems and entanglement on a quantum computer

Generation of coherence in an exactly solvable nonlinear nanomechanical system

Contact Info

Product

Resources

About