Perfect Quantum State Transfer in a Superconducting Qubit Chain with Parametrically Tunable Couplings

Li, X.; Ma, Yuxin; Han, Jie; Chen, Tao; Xu, Yihang; Cai, Wenli; Wang, H.; Song, Yipu; Xue, Zheng‐Yuan; Yin, Zhang‐qi; Sun, Luyan

doi:10.1103/physrevapplied.10.054009

Cited by 145 publications

(81 citation statements)

References 60 publications

(84 reference statements)

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“…a quantum state of the jth qubit can be perfectly transferred to the (N −j +1)th qubit after a period T = π/C 0 , where C 0 is the characteristic coupling strength. To date, the transfer protocol has been demonstrated in nuclear spins [27], optical waveguides [28][29][30], and superconducting qubits [31]. Actually, the core of this protocol ensures the excited part in the single-excitation subspace, and there is a phase factor (−1) N −1 accumulated after a full cycle of forward and backward transfer that only depends on the parity of the number of nodes participating in the transfer protocol [24].…”

Section: Perfect-transfer Schemementioning

confidence: 99%

Perfect coherent transfer in an on-chip reconfigurable nanoelectromechanical network

et al. 2020

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Realizing a controllable network with multiple degrees of interaction is a challenge to physics and engineering. Here, we experimentally report an on-chip reconfigurable network based on nanoelectromechanical resonators with nearest-neighbor (NN) and next-nearest-neighbor (NNN) strong couplings. By applying different parametric voltages on the same on-chip device, we carry out perfect coherent transfer in NN and NNN coupled array networks. Moreover, the low-loss resonators ensure the desired evolution to achieve perfect transfer and the demonstration of the parity-dependent phase relation at transmission cycles. The realization of NNN couplings demonstrates the capability of engineering coherent coupling beyond a simple model of a NN coupled array of doubly clamped resonators. Our reconfigurable nanoelectromechanical network provides a highly tunable physical platform and offers the possibilities of investigating various interesting phenomena, such as topological transport, synchronization of networks, as well as metamaterials.

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Section: Perfect-transfer Schemementioning

confidence: 99%

Perfect coherent transfer in an on-chip reconfigurable nanoelectromechanical network

et al. 2020

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“…(1), H tot (t ) = H Q (t ) + H QC (t ). These can be engineered [34][35][36][37] in the gmon architecture of flux tunable transmons qubits with fixed capacitive couplings to their cavities through oscillating the qubit energy near the difference of the qubit and cavity frequencies (red) or driving the qubit or cavity at frequencies near half the sum of the two frequencies (blue). Since the cavities are fixed frequency objects and the QCi terms are small, we do not need to worry about bath spectral densities and can well-characterize their lossy behavior through simple O i = √ Ci a C j , where Ci is the cavity loss rate.…”

Section: Proposed Protocolmentioning

confidence: 99%

Entanglement and complexity of interacting qubits subject to asymmetric noise

Kapit

Roushan

Neill

et al. 2020

Phys. Rev. Research

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The simulation complexity of predicting the time evolution of delocalized many-body quantum systems has attracted much recent interest, and simulations of such systems in real quantum hardware are promising routes to demonstrating a quantum advantage over classical machines. In these proposals, random noise is an obstacle that must be overcome for a faithful simulation, and a single error event can be enough to drive the system to a classically trivial state. We argue that this need not always be the case, and consider a modification to a leading quantum sampling problem-time evolution in an interacting Bose-Hubbard chain of transmon qubits [Neill et al., Science 360, 195 (2018)]-where each site in the chain has a driven coupling to a lossy cavity and particle number is no longer conserved. With cavity noise (but not qubit error) now included in the problem definition, the resulting quantum dynamics are still complex and highly nontrivial. We argue that this problem is harder to simulate than the isolated chain, and that it can achieve volume-law entanglement even in the strong noise limit, likely persisting up to system sizes beyond the scope of classical simulation. Further, we show that the metrics which suggest classical intractability for the isolated chain point to similar conclusions in the noisy case. These results suggest that quantum sampling problems including nontrivial noise could be good candidates for demonstrating a quantum advantage in near-term hardware.

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“…By using SC qubits, the experimental demonstrations of single-qubit gates [29,30], two-qubit gates [31,32], three-qubit gates [33,34], 10-qubit entanglement [35], 12-qubit entanglement [36], 18-qubit entanglement [37], and 20-qubit Schrödinger cat states [37] have been reported. Moreover, quantum teleportation between two distant SC qubits [38], quantum state transfer in a SC qubit chain [39], entanglement swapping in superconducting circuit [40], and quantum walks in a 12-qubit superconducting processor [41] have been realized in experiments.…”

Section: Introductionmentioning

confidence: 99%

Transferring entangled states of photonic cat-state qubits in circuit QED

et al. 2020

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We propose a method for transferring quantum entangled states of two photonic cat-state qubits (cqubits) from two microwave cavities to the other two microwave cavities. This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit. Because of using four cavities with different frequencies, the inter-cavity crosstalk is significantly reduced. Since only one coupler qutrit is used, the circuit resources is minimized. The entanglement transfer is completed with a single-step operation only, thus this proposal is quite simple. The third energy level of the coupler qutrit is not populated during the state transfer, therefore decoherence from the higher energy level is greatly suppressed. Our numerical simulations show that high-fidelity transfer of two-cqubit entangled states from two transmission line resonators to the other two transmission line resonators is feasible with current circuit QED technology. This proposal is universal and can be applied to accomplish the same task in a wide range of physical systems, such as four microwave or optical cavities, which are coupled to a natural or artificial three-level atom.

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Perfect Quantum State Transfer in a Superconducting Qubit Chain with Parametrically Tunable Couplings

Cited by 145 publications

References 60 publications

Perfect coherent transfer in an on-chip reconfigurable nanoelectromechanical network

Perfect coherent transfer in an on-chip reconfigurable nanoelectromechanical network

Entanglement and complexity of interacting qubits subject to asymmetric noise

Transferring entangled states of photonic cat-state qubits in circuit QED

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