Riken Corporation

Jeol Ltd.

Nippon Telegraph and Telephone Corporation

Hidetoshi Katori

Masao Takamoto

Shigenori Tsuji

Katsuya Oguri

Hideki Gotoh

Atsushi Ishizawa

Hiromitsu Imai

Hideo Yokota

Ichiro Ushijima

Tomoyo Akatsuka

Takehiro Tawara

Tomoya Akatsuka

A tri-axial magnetic field correction coil includes a first coil group and a second coil group with respect to an X-axis direction that passes through a clock transition space in which atoms are disposed. The first coil group is a Helmholtz-type coil composed in a point-symmetrical shape around the clock transition space. The second coil group is composed in a point-symmetrical shape around the clock transition space with respect to the X-axis direction, and is a non-Helmholtz-type coil that differs from the first coil group in terms of coil size, coil shape, or distance between coils.

Tri-axial magnetic field correction coil, physical package, physical package for optical lattice clock, physical package for atomic clock, physical package for atom interferometer, physical package for quantum information processing device, and physical package system

A magneto-optical trap method including applying a magnetic field to an atom encapsulated in a vacuum vessel and having a nuclear spin of not less than 3/2 by using an anti-Helmholtz coil. Then generating a laser beam including a first laser beam detuned from a first resonance frequency when the atom transits from a total angular momentum quantum number F in a ground state to a total angular momentum quantum number F'=F+1 in an excited state, and a second laser beam detuned from a second resonance frequency when the atom transits from the total angular momentum quantum number F in the ground state to a total angular momentum quantum number F′=F−1 in the excited state.

Magneto-optical trap method and apparatus using positive and negative g-factors

There is a need to maintain or enhance the magnetic field correction accuracy of a physics package while making the physics package more compact and portable. A triaxial magnetic field correction coil is provided inside a vacuum chamber surrounding a clock transition space having atoms disposed therein. The triaxial magnetic field correction coil is formed into a shape such that it is possible to correct, for magnetic field components of three axial directions passing through the clock transition space, a constant term, a first order spatial derivative term, a second order spatial derivative term, a third or higher order spatial derivative term, or some given combination of these terms. The triaxial magnetic field correction coil can be used in, for example, a physics package for an optical lattice clock.

Triaxial magnetic field correction coil, physics package, physics package for optical lattice clock, physics package for atomic clock, physics package for atom interferometer, physics package for quantum information processing device, and physics package system

An optical lattice clock includes a clock transition space having disposed therein an atom group trapped in an optical lattice, and a triaxial magnetic field correction coil for correcting the magnetic field of the clock transition space. Additionally, in a correction space that includes the clock transition space and is larger than the clock transition space, a photoreceiver promotes the clock transition of the atom group trapped in the optical lattice and acquires a clock transition frequency distribution for the correction space. Further, a corrector corrects the magnetic field of the triaxial magnetic field correction coil on the basis of the frequency distribution measured by the photo receiver.

Optical lattice clock and magnetic field correction method for optical lattice clock

A magneto-optical trap apparatus includes a vacuum vessel for encapsulating an atom to be trapped, an anti-Helmholtz coil for applying a magnetic field to an inside of the vacuum vessel, a laser device for generating a laser beam, and an irradiation device for irradiating the generated laser beam from a plurality of directions. The laser beam includes a first laser beam detuned from a first resonance frequency when the atom transits from a total angular momentum quantum number F in a ground state to a total angular momentum quantum number F'=F+1 in an excited state, and a second laser beam detuned from a second resonance frequency when the atom transits from the total angular momentum quantum number F in the ground state to a total angular momentum quantum number F&#x2032;=F&#x2212;1 in the excited state, among transitions from J=0 in a ground state to J&#x2032;=1 in an excited state.

Provided according to an embodiment of the present disclosure is a radiation shieldincluding a shield wall surrounding a hollow region capable of accommodating therein atoms for an optical lattice clock, the shield wall having, provided therein, at least two apertures communicating with outside. A geometrical shape of an inner wall surface of the shield wall is configured such that a difference between BBR shifts found under two conditions does not exceed a predetermined value over a range of position of atoms, the BBR shifts being caused in atomsby emitted radiation emitted by the inner wall surface, incoming radiation leaking in from the outside through the apertures, and a reflection component of the emitted radiation and incoming radiation at the inner wall surface, the two conditions being a condition where the inner wall surface exhibits mirror reflection and a condition where the inner wall surface exhibits diffuse reflection, the range being where clock transition operation is carried out in the optical lattice clock, the inner wall surface facing the hollow region. Provided according to other embodiments of the present disclosure also are the optical lattice clockincluding such a radiation shield, and a design method for the radiation shield.

Radiation shield and optical lattice clock including radiation shield

An embodiment of an optical lattice clock comprising atoms and a laser light source at an operational magic frequency is provided. The atoms are capable of making a clock transition between two levels of electronic states, and the laser light source generates at least a pair of counterpropagating laser beams, each of which having a lattice-laser intensity I. The pair of counterpropagating laser beams forms an optical lattice potential for trapping the atoms at around antinodes of a standing wave created by it. The operational magic frequency is one of the frequencies that have an effect of making lattice-induced clock shift of the clock transition insensitive to variation &#x394;I of the lattice-laser intensity I, the lattice-induced clock shift being a shift in a frequency for the clock transition of the atoms caused by the variation &#x394;I of the lattice-laser intensity I.

Optical lattice clock at operational magic frequency and method for operating the same

Various embodiments improve accuracy by increasing the number of atoms engaged in a clock transitions in an optical lattice clock. An exemplary optical lattice clock an embodiment comprises an optical waveguide, an optical path, a laser light source, and a laser cooler. The optical path has a hollow pathway that extends from a first end to a second end while being surrounded with a tubular wall, which is used as a waveguide path. The optical path passes between mirrors and through the pathway. The laser light source supplies to the optical path a pair of lattice lasers (Land L) propagating in opposite directions with each other. The laser cooler supplies cooled atoms that have two levels of electronic states associated with a clock transition to the vicinity of the first end of the optical waveguide.

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Wako, Japan

Hidetoshi Katori