The Experts below are selected from a list of 43209 Experts worldwide ranked by ideXlab platform

Sae Woo Nam - One of the best experts on this subject based on the ideXlab platform.

  • Quantum teleportation over 100 km of fiber using highly efficient superconducting nanowire single photon detectors
    Optica, 2015
    Co-Authors: Hiroki Takesue, Shellee D Dyer, Martin J Stevens, Varun B Verma, Richard P Mirin, Sae Woo Nam
    Abstract:

    Quantum teleportation is an essential Quantum Operation by which we can transfer an unknown Quantum state to a remote location with the help of Quantum entanglement and classical communication. Since the first experimental demonstrations using photonic qubits and continuous variables, the distance of photonic Quantum teleportation over free-space channels has continued to increase and has reached >100  km. On the other hand, Quantum teleportation over optical fiber has been challenging, mainly because the multifold photon detection that inevitably accompanies Quantum teleportation experiments has been very inefficient due to the relatively low detection efficiencies of typical telecom-band single-photon detectors. Here, we report on Quantum teleportation over optical fiber using four high-detection-efficiency superconducting nanowire single-photon detectors (SNSPDs). These SNSPDs make it possible to perform highly efficient multifold photon measurements, allowing us to confirm that the Quantum states of input photons were successfully teleported over 100 km of fiber with an average fidelity of 83.7±2.0%.

  • Quantum teleportation over 100 km of fiber using highly efficient superconducting nanowire single photon detectors
    arXiv: Quantum Physics, 2015
    Co-Authors: Hiroki Takesue, Shellee D Dyer, Martin J Stevens, Varun B Verma, Richard P Mirin, Sae Woo Nam
    Abstract:

    Quantum teleportation is an essential Quantum Operation by which we can transfer an unknown Quantum state to a remote location with the help of Quantum entanglement and classical communication. Since the first experimental demonstrations using photonic qubits and continuous variables, the distance of photonic Quantum teleportation over free space channels has continued to increase and has reached >100 km. On the other hand, Quantum teleportation over optical fiber has been challenging, mainly because the multi-fold photon detection that inevitably accompanies Quantum teleportation experiments has been very inefficient due to the relatively low detection efficiencies of typical telecom-band single photon detectors. Here, we report efficient Quantum teleportation over optical fiber using four high-detection efficiency superconducting nanowire superconducting single-photon detectors (SNSPD) based on MoSi. These SNSPDs make it possible to perform highly-efficient multi-fold photon measurements, allowing us to confirm that the Quantum states of input photons were successfully teleported over 100 km of fiber.

Lo P Presti - One of the best experts on this subject based on the ideXlab platform.

  • Quantum tomography for measuring experimentally the matrix elements of an arbitrary Quantum Operation
    Physical Review Letters, 2001
    Co-Authors: Giacomo Mauro Dariano, Lo P Presti
    Abstract:

    Quantum Operations describe any state change allowed in Quantum mechanics, including the evolution of an open system or the state change due to a measurement. We present a general method based on Quantum tomography for measuring experimentally the matrix elements of an arbitrary Quantum Operation. As input the method needs only a single entangled state. The feasibility of the technique for the electromagnetic field is shown, and the experimental setup is illustrated based on homodyne tomography of a twin beam.

  • Quantum tomography for measuring experimentally the matrix elements of an arbitrary Quantum Operation
    Physical Review Letters, 2001
    Co-Authors: Giacomo Mauro Dariano, Lo P Presti
    Abstract:

    Theoretical Quantum Optics Group, INFM Unit`a di PaviaDipartimento di Fisica ’Alessandro Volta’ – Universit`a di Pavia via Bassi 6, I-27100 Pavia, Italy(February 1, 2008)Quantum Operations describe any state change allowed inQuantum mechanics, including the evolution of an open sys-tem or the state change due to a measurement. In this letterwe present a general method based on Quantum tomographyfor measuring experimentally the matrix elements of an arbi-trary Quantum Operation. As input the method needs only asingle entangled state. The feasibility of the technique for theelectromagnetic field is shown, and the experimental setup isillustrated based on homodyne tomography of a twin-beam.

Hiroki Takesue - One of the best experts on this subject based on the ideXlab platform.

  • Quantum teleportation over 100 km of fiber using highly efficient superconducting nanowire single photon detectors
    Optica, 2015
    Co-Authors: Hiroki Takesue, Shellee D Dyer, Martin J Stevens, Varun B Verma, Richard P Mirin, Sae Woo Nam
    Abstract:

    Quantum teleportation is an essential Quantum Operation by which we can transfer an unknown Quantum state to a remote location with the help of Quantum entanglement and classical communication. Since the first experimental demonstrations using photonic qubits and continuous variables, the distance of photonic Quantum teleportation over free-space channels has continued to increase and has reached >100  km. On the other hand, Quantum teleportation over optical fiber has been challenging, mainly because the multifold photon detection that inevitably accompanies Quantum teleportation experiments has been very inefficient due to the relatively low detection efficiencies of typical telecom-band single-photon detectors. Here, we report on Quantum teleportation over optical fiber using four high-detection-efficiency superconducting nanowire single-photon detectors (SNSPDs). These SNSPDs make it possible to perform highly efficient multifold photon measurements, allowing us to confirm that the Quantum states of input photons were successfully teleported over 100 km of fiber with an average fidelity of 83.7±2.0%.

  • Quantum teleportation over 100 km of fiber using highly efficient superconducting nanowire single photon detectors
    arXiv: Quantum Physics, 2015
    Co-Authors: Hiroki Takesue, Shellee D Dyer, Martin J Stevens, Varun B Verma, Richard P Mirin, Sae Woo Nam
    Abstract:

    Quantum teleportation is an essential Quantum Operation by which we can transfer an unknown Quantum state to a remote location with the help of Quantum entanglement and classical communication. Since the first experimental demonstrations using photonic qubits and continuous variables, the distance of photonic Quantum teleportation over free space channels has continued to increase and has reached >100 km. On the other hand, Quantum teleportation over optical fiber has been challenging, mainly because the multi-fold photon detection that inevitably accompanies Quantum teleportation experiments has been very inefficient due to the relatively low detection efficiencies of typical telecom-band single photon detectors. Here, we report efficient Quantum teleportation over optical fiber using four high-detection efficiency superconducting nanowire superconducting single-photon detectors (SNSPD) based on MoSi. These SNSPDs make it possible to perform highly-efficient multi-fold photon measurements, allowing us to confirm that the Quantum states of input photons were successfully teleported over 100 km of fiber.

Giacomo Mauro Dariano - One of the best experts on this subject based on the ideXlab platform.

  • Quantum tomography for measuring experimentally the matrix elements of an arbitrary Quantum Operation
    Physical Review Letters, 2001
    Co-Authors: Giacomo Mauro Dariano, Lo P Presti
    Abstract:

    Quantum Operations describe any state change allowed in Quantum mechanics, including the evolution of an open system or the state change due to a measurement. We present a general method based on Quantum tomography for measuring experimentally the matrix elements of an arbitrary Quantum Operation. As input the method needs only a single entangled state. The feasibility of the technique for the electromagnetic field is shown, and the experimental setup is illustrated based on homodyne tomography of a twin beam.

  • Quantum tomography for measuring experimentally the matrix elements of an arbitrary Quantum Operation
    Physical Review Letters, 2001
    Co-Authors: Giacomo Mauro Dariano, Lo P Presti
    Abstract:

    Theoretical Quantum Optics Group, INFM Unit`a di PaviaDipartimento di Fisica ’Alessandro Volta’ – Universit`a di Pavia via Bassi 6, I-27100 Pavia, Italy(February 1, 2008)Quantum Operations describe any state change allowed inQuantum mechanics, including the evolution of an open sys-tem or the state change due to a measurement. In this letterwe present a general method based on Quantum tomographyfor measuring experimentally the matrix elements of an arbi-trary Quantum Operation. As input the method needs only asingle entangled state. The feasibility of the technique for theelectromagnetic field is shown, and the experimental setup isillustrated based on homodyne tomography of a twin-beam.

Andrea Morello - One of the best experts on this subject based on the ideXlab platform.

  • conditional Quantum Operation of two exchange coupled single donor spin qubits in a mos compatible silicon device
    Nature Communications, 2021
    Co-Authors: Mateusz Ma T Dzik, Arne Laucht, F E Hudson, Alexander M Jakob, B C Johnson, D N Jamieson, Kohei M Itoh, A S Dzurak, Andrea Morello
    Abstract:

    Silicon nanoelectronic devices can host single-qubit Quantum logic Operations with fidelity better than 99.9%. For the spins of an electron bound to a single-donor atom, introduced in the silicon by ion implantation, the Quantum information can be stored for nearly 1 second. However, manufacturing a scalable Quantum processor with this method is considered challenging, because of the exponential sensitivity of the exchange interaction that mediates the coupling between the qubits. Here we demonstrate the conditional, coherent control of an electron spin qubit in an exchange-coupled pair of 31P donors implanted in silicon. The coupling strength, J = 32.06 ± 0.06 MHz, is measured spectroscopically with high precision. Since the coupling is weaker than the electron-nuclear hyperfine coupling A ≈ 90 MHz which detunes the two electrons, a native two-qubit controlled-rotation gate can be obtained via a simple electron spin resonance pulse. This scheme is insensitive to the precise value of J, which makes it suitable for the scale-up of donor-based Quantum computers in silicon that exploit the metal-oxide-semiconductor fabrication protocols commonly used in the classical electronics industry.