Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED

Zhang, Yuxiang; Carceller, Carles Roch i; Kjærgaard, Morten; Sørensen, Anders S.

doi:10.1103/physrevlett.127.233601

Cited by 18 publications

(7 citation statements)

References 41 publications

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“…4(a)]. Additionally, the emitter is assumed to be of giant atom form [60][61][62][63][64][65][66][67][68][69], which couples to the waveguide at two points x ± of channel A (or B), as depicted in Fig. 4(b).…”

Section: Periodical Interference Behavior Modulated By Giant Emitter'...mentioning

confidence: 99%

“…Due to spinmomentum locking, the emitter chirally dissipates almost all its energy into one direction of the waveguide. Second, the emitter is considered as giant atom form, and couples to the waveguide at multiple sites [60][61][62][63][64][65][66][67][68][69]. Given that emitters' frequency is below two degenerate minima points induced by the spin-orbit coupling, the bound states will be periodically modulated by giant atom's size due to quantum interference.…”

Section: Introductionmentioning

confidence: 99%

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Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Wang,

Gao,

et al. 2022

Preprint

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We propose a novel quantum electrodynamics (QED) platform where quantum emitters interact with a Hofstadter-ladder waveguide. We demonstrate several intriguing phenomena stemming from the exotic dispersion relation and vacuum mode properties led by the effective spin-orbit coupling, which have no analog in other QED setups. First, by assuming emitter's frequency to be resonant with the lower band, we find that the spontaneous emission is chiral with most photonic field decaying unidirectionally. Both numerical and analytical results indicate that the Hofstadter-ladder waveguide can be engineered as a well-performed chiral quantum bus. Second, the dynamics of emitters of giant atom form is explored by considering their frequencies below the lower band. Due to quantum interference, we find that both the emitter-waveguide interaction and the amplitudes of bound states are periodically modulated by giant emitter's size. The periodical length depends on the positions of energy minima points induced by the spin-orbit coupling. Last, we consider the interaction between two giant emitters mediated by bound states, and find that their dipole-dipole interaction vanishes (is enhanced) when maximum destructive (constructive) interference happens.

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Section: Periodical Interference Behavior Modulated By Giant Emitter'...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Wang,

Gao,

et al. 2022

Preprint

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“…Recent work unveils the behavior of giant atoms coupled to a non-Hermitian Hatano-Nelson (HN) mode due to the asymmetric inter-site tunneling rates [30]. Giant atoms with chiral quantum optics [25,29,[31][32][33][34][35][36] have opened new possibilities to realize chiral or nonreciprocal phenomena such as directed emission and chiral bound states [37,38]. The entanglement dynamics [39] and non-Markovian disentanglement dynamics [40] in double-giant-atom waveguide-QED systems were studied for separated, braided, and nested coupling configurations.…”

Section: Introductionmentioning

confidence: 99%

Catch and release of propagating bosonic field with non-Markovian giant atom

Xu,

Guo

2024

New J. Phys.

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The non-Markovianity of physical systems is considered to be a valuable resource that has potential applications to quantum information processing. The control of traveling quantum fields encoded with information (flying qubit) is crucial for quantum networks. In this work, we propose to catch and release the propagating photon/phonon with a non-Markovian giant atom, which is coupled to the environment via multiple coupling points. Based on the Heisenberg equation of motion for the giant atom and field operators, we calculate the time-dependent scattering coefficients from the linear response theory and define the criteria for the non-Markovian giant atom. We analyze and numerically verify that the field bound states due to non-Markovianity can be harnessed to catch and release the propagating bosonic field on demand by tuning the parameters of giant atom.

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“…However, the modulating signal in our proposal is the electromagnetic current bias (rather than acoustic waves), which can be tuned much faster and freely. Our proposal can be employed for demonstrating chiral quantum optics widely discussed in [76][77][78][79][80][81][82][83][84][85], and provide a novel method to realize nonreciprocal transport of microwave photons without using the bulky ferrite circulator [86,87]. Very recent studies with circuit-QED setups showed that chiral emission from qubit pairs (coupled to a common waveguide) can be realized via linear interference process [80][81][82][83].…”

Section: Introductionmentioning

confidence: 99%

Chiral SQUID-metamaterial waveguide for circuit-QED

Wang

Lin

et al. 2022

New J. Phys.

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Superconducting metamaterials, which are designed and fabricated with structured fundamental circuit elements, have motivated recent developments of exploring unconventional quantum phenomena in circuit quantum electrodynamics (circuit-QED). We propose a method to engineer 1D Josephson metamaterial as a chiral waveguide by considering a programmed spatiotemporal modulation on its effective impedance. The modulation currents are in the form of traveling waves which phase velocities are much slower than the propagation speed of microwave photons. Due to the Brillouin-scattering process, non-trivial spectrum regimes where photons can propagate unidirectionally emerge. Considering superconducting qubits coupling with this metamaterial waveguide, we analyze both Markovian and non-Markovian quantum dynamics, and find that superconducting qubits can dissipate photons unidirectionally. Moreover, we show that our proposal can be extended a cascaded quantum network with multiple nodes, where chiral photon transport between remote qubits can be realized. Our work might open the possibilities to exploit SQUID metamaterials for realizing unidirectional photon transport in circuit-QED platforms.

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Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED

Cited by 18 publications

References 41 publications

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide

Catch and release of propagating bosonic field with non-Markovian giant atom

Chiral SQUID-metamaterial waveguide for circuit-QED

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