Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%

• URL: http://arxiv.org/abs/2111.09915v2
• Date: Thu, 12 May 2022 15:56:06 GMT
• Title: Quantum-Logic Gate between Two Optical Photons with an Average Efficiency above 40%
• Abstract summary: A large challenge is to overcome the low efficiency of two-qubit logic gates. Here we report on a new platform that was designed to surpass this long-standing record. We demonstrate a CNOT gate between two optical photons with an average efficiency of 41.7(5)% at a postselected process fidelity of 81(2)%.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optical qubits uniquely combine information transfer in optical fibers with a good processing capability and are therefore attractive tools for quantum technologies. A large challenge, however, is to overcome the low efficiency of two-qubit logic gates. The experimentally achieved efficiency in an optical controlled NOT (CNOT) gate reached approximately 11% in 2003 and has seen no increase since. Here we report on a new platform that was designed to surpass this long-standing record. The new scheme avoids inherently probabilistic protocols and, instead, combines aspects of two established quantum nonlinear systems: atom-cavity systems and Rydberg electromagnetically induced transparency. We demonstrate a CNOT gate between two optical photons with an average efficiency of 41.7(5)% at a postselected process fidelity of 81(2)%. Moreover, we extend the scheme to a CNOT gate with multiple target qubits and produce entangled states of presently up to five photons. All these achievements are promising and have the potential to advance optical quantum information processing in which almost all advanced protocols would profit from high-efficiency logic gates.

Related papers

• Photon Sorting with a Quantum Emitter [1.044827820892363]
  We demonstrate a photon-sorting circuit based on the induced nonlinearity arising from photon scattering in a solid-state quantum emitter.<n>We find that the current system can enable BSMs with a 57% post-selected success probability without ancillary photons, exceeding the linear-optical limit of 50%.
  arXiv  Detail & Related papers  (2026-04-23T15:06:18Z)
• Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks [49.82426139329382]
  We present a simple yet high-performance on-chip polarization-entangled photon-pair source on thin-film lithium niobate (TFLN)<n>Our device employs dual quasi-phase matching (D-QPM) that sequentially supports type-0 and type-I spontaneous parametric down-conversion in a single nanophotonic waveguide.<n>We realize wavelength-multiplexed entanglement distribution in a four-user quantum network deployed over metropolitan fiber links up to 50 km.
  arXiv  Detail & Related papers  (2025-11-27T18:30:01Z)
• Cavity-based optical switching via phase modulation in warm rubidium vapor [0.0]
  Optical switching remains a key outstanding challenge for scalable fault-tolerant photonic quantum computing.<n>We present a cavity-based optical switch that overcomes this limitation, demonstrating 22 ns rise time, insertion loss of 2.4 dB, and 17.5 dB extinction ratio.<n>The ultimate performance of our switch, combining both speed and efficiency, will find applications in active multiplexing, loop-based quantum memory, and feedforward for quantum error-correction protocols.
  arXiv  Detail & Related papers  (2025-08-08T12:21:27Z)
• Computing-heightened low-cost high-dimensional controlled-SUM gates [0.0]
  Qudit-based quantum gates offer several advantages over qubit-based counterparts.<n>We present three realistic protocols for implementing a 4$times$4-dimensional (16D) two-qudit controlled-SUM gate.
  arXiv  Detail & Related papers  (2025-04-24T09:13:26Z)
• Bell state generation and CNOT operation using on-demand identical photons from shape-controlled spatially ordered quantum dots [2.368393320613973]
  We develop a platform of mesa-top single quantum dots (MTSQDs) located in designed regular arrays. A Bell state fidelity of 0.825$pm$0.010 is achieved with two photon interference (TPI) visibility of 0.947$pm$0.0015 at 4K without Purcell enhancement.
  arXiv  Detail & Related papers  (2024-11-07T04:04:11Z)
• Heralded High-Dimensional Photon-Photon Quantum Gate [4.602787223342753]
  A major obstacle for realizing quantum gates between two individual photons is the restriction of direct interaction between photons in linear media. We present a protocol for realizing an entangling gate -- the controlled phase-flip (CPF) gate -- for two photonic qudits in arbitrary dimension. We experimentally demonstrate this protocol by realizing a four-dimensional qudit-qudit CPF gate, whose decomposition would require at least 13 two-qubit entangling gates.
  arXiv  Detail & Related papers  (2024-07-23T10:00:12Z)
• All-optical modulation with single-photons using electron avalanche [69.65384453064829]
  We demonstrate all-optical modulation using a beam with single-photon intensity. Our approach opens up the possibility of terahertz-speed optical switching at the single-photon level.
  arXiv  Detail & Related papers  (2023-12-18T20:14:15Z)
• Quantum Key Distribution With an Integrated Photonic Receiver [41.94295877935867]
  Photonic integrated circuits (PICs) are key in advancing quantum technologies for secure communications. We implement a three-state BB84 protocol with decoy-state method to enhance quantum communications. One of the most notable results is the extraction of a secret key over a record-breaking 45 dB channel attenuation.
  arXiv  Detail & Related papers  (2023-10-25T15:19:19Z)
• Deterministic entangling gates with nonlinear quantum photonic interferometers [0.0]
  We propose to exploit weakly nonlinear photonic devices to implement deterministic entangling quantum gates. It is shown that a universal set of single- and two-qubit gates can be designed by a suitable concatenation of few optical interferometric elements.
  arXiv  Detail & Related papers  (2023-06-08T09:43:48Z)
• Integrated Quantum Optical Phase Sensor [48.7576911714538]
  We present a photonic integrated circuit fabricated in thin-film lithium niobate. We use the second-order nonlinearity to produce a squeezed state at the same frequency as the pump light and realize circuit control and sensing with electro-optics. We anticipate that on-chip photonic systems like this, which operate with low power and integrate all of the needed functionality on a single die, will open new opportunities for quantum optical sensing.
  arXiv  Detail & Related papers  (2022-12-19T18:46:33Z)
• Refined quantum gates for $\Lambda$-type atom-photon hybrid systems [3.1273732288852716]
  We present protocols for realizing controlled-not (CNOT), Fredkin, and Toffoli gates on hybrid systems. The first control qubit of our gates is encoded on a flying photon, and the rest qubits are encoded on the atoms in optical cavity. These quantum gates can be extended to the optimal synthesis of multi-qubit CNOT, Fredkin and Toffoli gates.
  arXiv  Detail & Related papers  (2022-10-19T14:42:09Z)
• Amplification of cascaded downconversion by reusing photons with a switchable cavity [62.997667081978825]
  We propose a scheme to amplify triplet production rates by using a fast switch and a delay loop. Our proof-of-concept device increases the rate of detected photon triplets as predicted.
  arXiv  Detail & Related papers  (2022-09-23T15:53:44Z)
• Linear optical universal quantum gates with higher success probabilities [0.0]
  We construct two compact quantum circuits to implement post-selected controlled-phase-flip (CPF) gate and Toffoli gate. Linear optical implementations of the presented two universal gates are feasible under current technology.
  arXiv  Detail & Related papers  (2022-08-13T08:58:19Z)
• Quantum-limited millimeter wave to optical transduction [50.663540427505616]
  Long distance transmission of quantum information is a central ingredient of distributed quantum information processors. Current approaches to transduction employ solid state links between electrical and optical domains. We demonstrate quantum-limited transduction of millimeter-wave (mmwave) photons into optical photons using cold $85$Rb atoms as the transducer.
  arXiv  Detail & Related papers  (2022-07-20T18:04:26Z)
• A bright and fast source of coherent single photons [46.25143811066789]
  A single photon source is a key enabling technology in device-independent quantum communication. We report a single photon source with an especially high system efficiency.
  arXiv  Detail & Related papers  (2020-07-24T17:08:46Z)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)
• On-demand indistinguishable single photons from an efficient and pure source based on a Rydberg ensemble [48.879585399382435]
  Single photons coupled to atomic systems have shown to be a promising platform for developing quantum technologies. Yet a bright on-demand, highly pure and highly indistinguishable single-photon source compatible with atomic platforms is lacking. In this work, we demonstrate such a source based on a strongly interacting Rydberg system.
  arXiv  Detail & Related papers  (2020-03-04T17:16:56Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.