Experimental on-demand recovery of entanglement by local operations within non-Markovian dynamics

Orieux, Adeline; D’Arrigo, A.; Ferranti, Giacomo; Franco, Rosario Lo; Benenti, Giuliano; Paladino, E.; Falci, G.; Sciarrino, Fabio; Mataloni, Paolo

doi:10.1038/srep08575

Cited by 150 publications

(115 citation statements)

References 56 publications

(79 reference statements)

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“…Then the effective Hamiltonians Eqs. (5,8) of the main text are obtained from Eq. S3 by bringing out of the integrals all the slowly varying terms and subsequently neglecting terms of order (δ k ij ∆t) −1 or higher, so that ∆t will not appear inH.…”

Section: Supplementary Materialsmentioning

confidence: 99%

“…Its demonstration would be a benchmark for the implementation of a class of multilevel advanced control procedures for quantum computation and microwave quantum photonics in systems based on artificial atoms. [6][7][8]. These are currently investigated roadmaps towards the design of fault tolerant hardware, i.e.…”

mentioning

confidence: 99%

“…Its demonstration would be a benchmark for the implementation of a class of multilevel advanced control procedures for quantum computation and microwave quantum photonics in systems based on artificial atoms. Advanced control of multilevel quantum systems is a key requirement of quantum technologies [1], enabling tasks like multiqubit or multistate device processing [2][3][4] by adiabatic protocols, topologically protected computation [5] or communication in distributed quantum networks [6][7][8]. These are currently investigated roadmaps towards the design of fault tolerant hardware, i.e.…”

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confidence: 99%

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Coherent manipulation of noise-protected superconducting artificial atoms in the Lambda scheme

et al. 2016

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We propose a new protocol for the manipulation of a three-level artificial atom in Lambda (Λ) configuration. It allows faithful, selective and robust population transfer analogous to stimulated Raman adiabatic passage (Λ-STIRAP), in last-generation superconducting artificial atoms, where protection from noise implies the absence of a direct pump coupling. It combines the use of a two-photon pump pulse with suitable advanced control, operated by a slow modulation of the phase of the external fields, leveraging on the stability of semiclassical microwave drives. This protocol is a building block for manipulation of microwave photons in complex quantum architectures. Its demonstration would be a benchmark for the implementation of a class of multilevel advanced control procedures for quantum computation and microwave quantum photonics in systems based on artificial atoms. [6][7][8]. These are currently investigated roadmaps towards the design of fault tolerant hardware, i.e. complex quantum architectures minimizing effects of decoherence [9,10]. In this scenario artificial atoms (AAs) are very promising since, compared to their natural counterparts, they allow for a larger degree of integration [11][12][13][14], on-chip tunability, stronger couplings [15] and easier production and detection of signals in the novel regime of microwave quantum photonics [16]. Decoherence due to strong coupling to the solid-state environment [6] is their major drawback. Over the years it has considerably softened [10] yielding last-generation superconducting devices with decoherence times in the range ∼ 1 − 100 µs [2, 4,20].Combining potential advantages of AAs is by no means straightforward. Protection from decoherence often implies strong constraints to available external control, which pose key challenges when larger architectures are considered [14]. In this work we study a simple and paradigmatic example, namely a three-level AA driven by a two-tone electric field in the Lambda (Λ) configuration [ Fig.1(a)]. Implementation of this control scheme in lastgeneration superconducting hardware may in principle benefit from low decoherence, which however is achieved at the expenses of suppressing the direct coupling of the pump field, and of possible limitations of selectivity in addressing specific transitions. In this work we show how to implement an efficient Λ configuration in these conditions, and we propose a dynamical scheme allowing to operate quantum control. This solves the problem raised in the last decade by several theoretical proposals on the implementation of advanced control by a Λ-scheme in AAs [3,[21][22][23][24][25], which still awaits experimental demonstration.Quantum control via a dynamical Λ scheme is very important because it may provide a fundamental building block for processing in complex architectures. Indeed adiabatic evolution may be used to trigger twophoton absorption-emission pumping cycles, which allow for on demand manipulation of individual photons in distributed quantum networks, as proposed in the ...

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Section: Supplementary Materialsmentioning

confidence: 99%

“…Its demonstration would be a benchmark for the implementation of a class of multilevel advanced control procedures for quantum computation and microwave quantum photonics in systems based on artificial atoms. [6][7][8]. These are currently investigated roadmaps towards the design of fault tolerant hardware, i.e.…”

mentioning

confidence: 99%

“…Its demonstration would be a benchmark for the implementation of a class of multilevel advanced control procedures for quantum computation and microwave quantum photonics in systems based on artificial atoms. Advanced control of multilevel quantum systems is a key requirement of quantum technologies [1], enabling tasks like multiqubit or multistate device processing [2][3][4] by adiabatic protocols, topologically protected computation [5] or communication in distributed quantum networks [6][7][8]. These are currently investigated roadmaps towards the design of fault tolerant hardware, i.e.…”

mentioning

confidence: 99%

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Coherent manipulation of noise-protected superconducting artificial atoms in the Lambda scheme

et al. 2016

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“…Recently, the lifetime of an entangled state of a superconducting flux qubit coupled to a microscopic two-level fluctuator has been enhanced by DD techniques 52 . Entanglement preservation between independent qubits (storage) from local pure dephasing random-telegraph and 1/f noise by dynamical decoupling has been predicted 53,54 and demonstrated in an all-optical experiment 55 .…”

Section: Introductionmentioning

confidence: 99%

High-fidelity two-qubit gates via dynamical decoupling of local1/fnoise at the optimal point

D’Arrigo¹,

Falci²,

Paladino³

2016

Phys. Rev. A

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We investigate the possibility to achieve high-fidelity universal two-qubit gates by supplementing optimal tuning of individual qubits with dynamical decoupling (DD) of local 1/f noise. We consider simultaneous local pulse sequences applied during the gate operation and compare the efficiencies of periodic, Carr-Purcell and Uhrig DD with hard π-pulses along two directions (π z/y pulses). We present analytical perturbative results (Magnus expansion) in the quasi-static noise approximation combined with numerical simulations for realistic 1/f noise spectra. The gate efficiency is studied as a function of the gate duration, of the number n of pulses, and of the high-frequency roll-off. We find that the gate error is non-monotonic in n, decreasing as n −α in the asymptotic limit, α ≥ 2 depending on the DD sequence. In this limit πz-Urhig is the most efficient scheme for quasi-static 1/f noise, but it is highly sensitive to the soft UV-cutoff. For small number of pulses, πz control yields anti-Zeno behavior, whereas πy pulses minimize the error for a finite n. For the current noise figures in superconducting qubits, two-qubit gate errors ∼ 10 −6 , meeting the requirements for fault-tolerant quantum computation, can be achieved. The Carr-Purcell-Meiboom-Gill sequence is the most efficient procedure, stable for 1/f noise with UV-cutoff up to gigahertz.

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“…In the theory of open quantum systems, the non-Markovian dynamics is one of main concerns being linked to the preservation of quantum memory stored in a quantum system [1,4,5]. It arises in many realistic situations [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], and also proves useful in quantum information processing such as quantum state engineering, quantum channel capacity and quantum control [4,[24][25][26][27][28]. The degree of a non-Markovian evolution, the socalled non-Markovianity, can be quantified by different measures based on dynamical features of the system capable to grasp the memory effects of the environment on the system evolution [28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Harnessing non-Markovian quantum memory by environmental coupling

2015

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Controlling the non-Markovian dynamics of open quantum systems is essential in quantum information technology since it plays a crucial role in preserving quantum memory. Albeit in many realistic scenarios the quantum system can simultaneously interact with composite environments, this condition remains little understood, particularly regarding the effect of the coupling between environmental parts. We analyze the non-Markovian behavior of a qubit interacting at the same time with two coupled single-mode cavities which in turn dissipate into memoryless or memory-keeping reservoirs. We show that increasing the control parameter, that is the two-mode coupling, allows for triggering and enhancing a non-Markovian dynamics for the qubit starting from a Markovian one in absence of coupling. Surprisingly, if the qubit dynamics is non-Markovian for zero control parameter, increasing the latter enables multiple transitions from non-Markovian to Markovian regimes. These results hold independently on the nature of the reservoirs. This work highlights that suitably engineering the coupling between parts of a compound environment can efficiently harness the quantum memory, stored in a qubit, based on non-Markovianity.

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Experimental on-demand recovery of entanglement by local operations within non-Markovian dynamics

Cited by 150 publications

References 56 publications

Coherent manipulation of noise-protected superconducting artificial atoms in the Lambda scheme

Coherent manipulation of noise-protected superconducting artificial atoms in the Lambda scheme

High-fidelity two-qubit gates via dynamical decoupling of local1/fnoise at the optimal point

Harnessing non-Markovian quantum memory by environmental coupling

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