Complete Frequency-Bin Bell Basis Synthesizer

Seshadri, Suparna; Lu, Hsuan-Hao; Leaird, Daniel E.; Weiner, Andrew M.; Lukens, Joseph M.

doi:10.1103/physrevlett.129.230505

Cited by 10 publications

(3 citation statements)

References 54 publications

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“…In a future version of the device the use of more than two rings for the definition of the state will allow the two configurations to have the same frequency spacing for the qubits. As a result, the device will be capable of generating all four Bell states with the same physical characteristics, as recently demonstrated using an external periodically poled lithium niobate crystal 24 ; it will also be used to explore more of the Hilbert space of the two qubits.…”

Section: Discussionmentioning

confidence: 91%

Programmable frequency-bin quantum states in a nano-engineered silicon device

et al. 2023

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Photonic qubits should be controllable on-chip and noise-tolerant when transmitted over optical networks for practical applications. Furthermore, qubit sources should be programmable and have high brightness to be useful for quantum algorithms and grant resilience to losses. However, widespread encoding schemes only combine at most two of these properties. Here, we overcome this hurdle by demonstrating a programmable silicon nano-photonic chip generating frequency-bin entangled photons, an encoding scheme compatible with long-range transmission over optical links. The emitted quantum states can be manipulated using existing telecommunication components, including active devices that can be integrated in silicon photonics. As a demonstration, we show our chip can be programmed to generate the four computational basis states, and the four maximally-entangled Bell states, of a two-qubits system. Our device combines all the key properties of on-chip state reconfigurability and dense integration, while ensuring high brightness, fidelity, and purity.

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Section: Discussionmentioning

confidence: 91%

Programmable frequency-bin quantum states in a nano-engineered silicon device

et al. 2023

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“…These Pauli measurements are equivalent to applying specific quantum gates-1 for Z, H for X, and HS † for Y -followed by a measurement in the computational basis, where 1 is the identity operation, H is the Hadamard, and S = ( 1 0 0 i ). For the H gate required in both X and Y measurements, we opted for an inherently probabilistic single-EOM version [69,70] that is simpler than the QFP Hadamard [14]. This method attains a theoretical fidelity of F W = 1 and success of P W ≈ 0.6).…”

Section: Black Box Characterizationmentioning

confidence: 99%

Characterization of Quantum Frequency Processors

Lu¹,

Peters²,

Weiner³

et al. 2023

Preprint

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Frequency-bin qubits possess unique synergies with wavelength-multiplexed lightwave communications, suggesting valuable opportunities for quantum networking with the existing fiber-optic infrastructure. Although the coherent manipulation of frequency-bin states requires highly controllable multi-spectral-mode interference, the quantum frequency processor (QFP) provides a scalable path for gate synthesis leveraging standard telecom components. Here we summarize the state of the art in experimental QFP characterization. Distinguishing between physically motivated "open box" approaches that treat the QFP as a multiport interferometer, and "black box" approaches that view the QFP as a general quantum operation, we highlight the assumptions and results of multiple techniques, including quantum process tomography of a tunable beamsplitter-to our knowledge the first full process tomography of any frequency-bin operation. Our findings should inform future characterization efforts as the QFP increasingly moves beyond proof-of-principle tabletop demonstrations toward integrated devices and deployed quantum networking experiments.

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“…We thank AdvR for loaning the PPLN ridge waveguide and acknowledge Navin B. Lingaraju, Poolad Imany and Daniel E. Leaird for their contributions to the extended works summarized here. 16,17 Funding was provided by the National Science Foundation (1839191-ECCS, 2034019-ECCS) and the U.S. Department of Energy (ERKJ353). A portion of this work was performed at Oak Ridge National Laboratory, operated by UT-Battelle for the U.S. Department of Energy under contract no.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Biphoton spectral quantum interference for information processing and delay metrology

Seshadri¹,

Lu²,

Lukens³

et al. 2023

Quantum Computing, Communication, and Simulation III

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Broadband time-energy entangled photons feature strong temporal correlations with potential for precision delay metrology, but previous work has leveraged only time-of-flight information ultimately limited by the detection jitter and resolution of the time-tagging electronics. Firstly, our work pushes the entanglement-based nonlocal delay metrology from the conventional time-of-flight measurement to a new direction-two-photon interferometry with subpicosecond sensitivity independent of detection resolution. Next, we show the selective sensitivity of frequency-bin encoded Bell states to the sum and difference of biphoton-delays by using a novel reconfigurable setup capable of switching between the Bell states by successively employing single and dual spectral-line pumps.

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Complete Frequency-Bin Bell Basis Synthesizer

Cited by 10 publications

References 54 publications

Programmable frequency-bin quantum states in a nano-engineered silicon device

Programmable frequency-bin quantum states in a nano-engineered silicon device

Characterization of Quantum Frequency Processors

Biphoton spectral quantum interference for information processing and delay metrology

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