Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons

Reuer, Kevin; Besse, Jean-Claude; Wernli, Lucien; Magnard, Paul; Kurpiers, Philipp; Norris, Graham J.; Wallraff, Andreas; Eichler, Christopher

doi:10.1103/physrevx.12.011008

Cited by 22 publications

(12 citation statements)

References 58 publications

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“…While we have only performed photon generation in this work, the time-reverse of the emission protocol can be used to capture photons with this same architecture if the wavepacket of the incoming photon is symmetric in time [19,22]. Note that the wavepacket of the generated photon can be shaped arbitrarily, in principle, by varying the time-dependence of the coupling between the data and emitter qubits [19,22,38,52]. Looking forward, we envision building a quantum network by tiling devices with the presented architecture in series and applying our protocol for both photon generation and capture.…”

Section: Discussionmentioning

confidence: 99%

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On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics

Kannan¹,

Almanakly²,

Sung³

et al. 2022

Preprint

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Routing quantum information between non-local computational nodes is a foundation for extensible networks of quantum processors. Quantum information can be transferred between arbitrary nodes by photons that propagate between them, or by resonantly coupling nearby nodes. Notably, conventional approaches involving propagating photons have limited fidelity due to photon loss and are often unidirectional, whereas architectures that use direct resonant coupling are bidirectional in principle, but can generally accommodate only a few local nodes. Here, we demonstrate high-fidelity, on-demand, bidirectional photon emission using an artificial molecule comprising two superconducting qubits strongly coupled to a waveguide. Quantum interference between the photon emission pathways from the molecule generate single photons that selectively propagate in a chosen direction. This architecture is capable of both photon emission and capture, and can be tiled in series to form an extensible network of quantum processors with all-to-all connectivity.

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Section: Discussionmentioning

confidence: 99%

“…Note that we can also vary we vary the effective coupling rate as a function of time by varying the frequency modulation amplitde A(t). This feature can be used to shape the wavepacket of the emitted photon, which will be necessary in future work for perfect absorption of the emitted photons [19,22,38,52].…”

Section: Parametric Exchange Interactionsmentioning

confidence: 99%

On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics

Kannan¹,

Almanakly²,

Sung³

et al. 2022

Preprint

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“…The latter scheme leads to an impedancematched lambda system that can be exploited for photodetection [69,70]. A scheme similar to the one used to generate Bell states may be used to realize photonphoton gates [71] across separate waveguides. When the waveguides are populated with thermal fields [37,38], and the dark and bright states are coherently coupled by demonstrated Raman process, the molecule operates as a quantum thermal machine (heat engine or refrigerator), paving the way for studies in quantum thermodynamics.…”

Section: Only â †mentioning

confidence: 99%

Engineering symmetry-selective couplings of a superconducting artificial molecule to microwave waveguides

Aamir¹,

Moreno²,

Sundelin³

et al. 2022

Preprint

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“…While Eq. (11) does not allow for an exact analytical solution, an approximate solution can be obtained when λ/ω 0 1 using a two time-scale method (see Supplemental Note 2 1). It reads, to first order in λ/ω 0 [22,38],…”

Section: Dmentioning

confidence: 99%

“…In addition, it is also exciting that controlled manipulation of quantum information has been demonstrated in recent years across various quantum platforms. Notable achievements include the ability to prepare desired quantum mechanical states on demand [8,9], perform gate operations [1,10,11], as well as quantum-limited measurements [12], and real-time feedback control [13].…”

mentioning

confidence: 99%

Cooling through parametric modulations and phase-preserving quantum measurements

Manikandan¹,

Qvarfort²

2022

Preprint

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We propose a cooling protocol that uses phase-preserving quantum measurements and phasedependent modulations of the trapping potential at parametric resonance to cool a quantum oscillator to near its quantum-mechanical ground-state. The sequential measurements and feedback provide a definite phase reference and stabilize the oscillator in the long-time limit. The protocol is robust against moderate amounts of dissipation and phase errors in the feedback loop. Our work has implications for the cooling of mechanical resonators and the integration of quantum refrigerators into quantum circuits.

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Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons

Cited by 22 publications

References 58 publications

On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics

On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics

Engineering symmetry-selective couplings of a superconducting artificial molecule to microwave waveguides

Cooling through parametric modulations and phase-preserving quantum measurements

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