Blade trap device for multi-ion trapping and multi-ion trapping method

Abstract

The invention discloses a blade trap device for multi-ion trapping and a multi-ion trapping method. The problem that multi-ions cannot be trapped stably in the prior art is solved. A blade trap device for multi-ion trapping comprises a radio frequency electrode and a DC compensation electrode. The radio frequency electrodes and the DC compensation electrodes are in a sheet shape, the two radio frequency electrodes are opposite, the two DC compensation electrodes are opposite, and the two radio frequency electrodes and the two DC compensation electrodes are distributed in an X shape with an ion trapping area as the axis. The DC compensation electrode is divided into at least two sections which are not communicated with each other from the edge of one side close to the axis in the radial direction of the axis. By using the device, the multi-ion trapping method comprises the following steps: applying a radio frequency signal and a radio frequency bias voltage on the radio frequency electrode; different DC voltages are applied to a plurality of segments of the DC compensation electrode. According to the device and the method provided by the invention, multiple ions can be stably trapped, and a relatively large light transmission area and an ion collection area are ensured.

Description

Technical Field

[0001] The present application relates to the technical fields of optical frequency standards and quantum precision measurement, and in particular to a blade trap device for multi-ion trapping and a multi-ion trapping method. Background Art

[0002] Ion traps can achieve ion trapping, and combined with technologies such as laser cooling, they can achieve precise ion manipulation. The design of ion trap electrodes of different configurations (linear traps, blade traps, cap traps, etc.) needs to meet the requirements of loading RF signals, bias voltages, compensation voltages, etc., in order to generate potential wells and suppress additional micro-motion of ions, so as to achieve long-term and stable ion trapping. At the same time, it is necessary to ensure a large light-transmitting area to meet the application requirements of ion interaction with multi-wavelength lasers. In addition, a larger solid angle of the fluorescence collection area is conducive to improving the detection signal-to-noise ratio of ion signals. In the case of trapping multiple ions, the existing technology generally compensates for the micro-motion of the ion ensemble as a whole, and it is difficult to compensate for the micro-motion of different ions in sections, resulting in poor ion micro-motion suppression effect, which is not conducive to the stable trapping of multiple ions.

[0003] Therefore, a blade trap device and method for trapping multiple ions are needed to stably trap multiple ions and ensure a larger light-transmitting area and ion collection area. Summary of the invention

[0004] The present application proposes a blade trap device and a method for trapping multiple ions, which solve the problem that the prior art cannot trap multiple ions stably.

[0005] In a first aspect, an embodiment of the present application provides a blade trap device for multi-ion trapping, comprising: a radio frequency electrode and a DC compensation electrode. The radio frequency electrode and the DC compensation electrode are in the form of sheets, and two radio frequency electrodes are opposite to each other, and two DC compensation electrodes are opposite to each other, and are distributed in an X shape with the ion trapping zone as the axis. The DC compensation electrode is divided into at least two non-interconnected segments along the radial direction of the axis from an edge close to the axis.

[0006] Furthermore, a DC grounding terminal is arranged at an edge of one side of the DC compensation electrode away from the axis, and the segments are all connected to the grounding terminal, and the segments are insulated from the grounding terminal.

[0007] In one of the embodiments, the angle between the RF electrode receiving the incident laser and the DC compensation electrode is an acute angle.

[0008] In one of the embodiments, the DC compensation electrode is etched with four slits symmetrically along the radial direction of the axis to divide the motor into five sections that are not connected to each other.

[0009] In one of the embodiments, the DC compensation electrode and the radio frequency electrode are provided with through holes on a side away from the axis, for fixing the electrodes on an insulating bracket.

[0010] In one embodiment, the DC compensation electrode is divided by slits, wherein the width of the slits is in the order of tens of micrometers, and each segment is in the order of hundreds of micrometers.

[0011] In one of the embodiments, the electrode is fixed in the vacuum physics system, and the DC ground terminal of the DC compensation electrode shares a common ground with the vacuum physics system.

[0012] In one embodiment, the gold-plated electrode is connected to the gold ribbon by pressure welding, and then the gold ribbon is connected to the copper wire by spot welding.

[0013] In one embodiment, the electrode material is alumina ceramic plated with gold.

[0014] In a second aspect, the embodiments of the present application further provide a method for trapping multiple ions, using the blade trap device for trapping multiple ions described in any one of the embodiments of the first aspect, comprising the steps of: Applying a radio frequency signal and a radio frequency bias voltage to the radio frequency electrode; Different DC voltages are applied to multiple segments of the DC compensation electrode.

[0015] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: The blade trap device and method for multi-ion trapping provided in the present application can stably trap multiple ions and ensure a larger light-transmitting area and ion collection area. In one embodiment, the vertical direction of the X configuration is the Z axis, the horizontal direction is the X axis, and the front and back are the Y axis. Fluorescence is collected above the X configuration, the left and right and the front and back are the light-transmitting areas, and the entire horizontal plane 360° can be used for laser incidence. Multiple ions are trapped along the Y axis. A larger ion fluorescence collection area, light-transmitting area, and ion trapping population area are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is a structural diagram of a blade trap device for multiple ion trapping according to an embodiment of the present application; Figure 2 This is a schematic diagram of the DC compensation electrode structure of an embodiment of the present application; Figure 3 A side view of a blade trap device for multiple ion trapping according to an embodiment of the present application; Figure 4A flow chart of a multi-ion trapping method according to an embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0018] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0019] Figure 1 This is a structural diagram of a blade trap device for multi-ion trapping according to an embodiment of the present application, including: a radio frequency electrode and a DC compensation electrode.

[0020] The radio frequency electrode and the DC compensation electrode are in sheet shape, and two radio frequency electrodes are opposite to each other, and two DC compensation electrodes are opposite to each other, and are distributed in an X shape with the ion trapping zone 4 as the axis.

[0021] The blade trap device for multi-ion trapping is in an X-configuration, and specifically comprises a first radio frequency electrode 101 , a second radio frequency electrode 102 , a first segmented DC compensation electrode 201 , and a second segmented DC compensation electrode 202 .

[0022] Preferably, the electrode material is gold-plated alumina ceramic.

[0023] The advantage of choosing alumina ceramic gold plating is that it has high processing precision and is not easy to break. The base material needs to meet the conditions of vacuum compatibility, high processing precision, insulation, etc., and there are fewer materials to choose from. Glass can also be used.

[0024] The first radio frequency electrode and the second radio frequency electrode are centrally symmetrically distributed relative to the ion-trapping zone; the first segmented DC compensation electrode and the second segmented DC compensation electrode are centrally symmetrically distributed relative to the ion-trapping zone.

[0025] The DC compensation electrode is divided into at least two segments which are not interconnected along the radial direction of the axis from an edge close to the axis.

[0026] It should be noted that the number of segments can be adjusted according to the number of trapped ions. The more segments there are, the finer the segmented compensation for multi-ion micro-motion. The segments of the two DC compensation electrodes need to correspond.

[0027] In one of the embodiments, the DC compensation electrode is etched with four slits symmetrically along the radial direction of the axis to divide the motor into five sections that are not connected to each other.

[0028] In one embodiment, the DC compensation electrode is divided by slits, wherein the width of the slits is in the order of tens of micrometers, and each segment is in the order of hundreds of micrometers.

[0029] For example, four slits are laser-etched radially and symmetrically on the DC compensation electrode to divide the electrode into five mutually unconnected sections. The slit width is in the order of tens of microns, and the width of each electrode section is about hundreds of microns.

[0030] At the end of the DC compensation electrode away from the ion trapping zone, only the gold-plated layer is laser etched to draw an insulating strip to separate the DC ground terminal.

[0031] Furthermore, a DC grounding terminal 3 is provided at an edge of the DC compensation electrode away from the axis, and the segments are all connected to the grounding terminal, and the segments are insulated from the grounding terminal.

[0032] At the end of the DC compensation electrode away from the ion trapping zone, only the gold-plated layer 31 is laser-etched to draw an insulating strip to separate the DC ground terminal.

[0033] In one of the embodiments, the DC compensation electrode and the radio frequency electrode are provided with through holes on a side away from the axis, for fixing the electrodes on an insulating bracket.

[0034] In one of the embodiments, the electrode is fixed in the vacuum physics system, and the DC ground terminal of the DC compensation electrode shares a common ground with the vacuum physics system.

[0035] For example, four through holes are evenly opened at the DC grounding end as fixing holes 6, and the electrode is fixed on the insulating bracket and then fixed in the vacuum physics system. The DC grounding end shares a common ground with the vacuum system.

[0036] The radio frequency electrode is also provided with a through hole which is the same as the DC grounding terminal as a fixing hole for fixing the radio frequency electrode.

[0037] like Figure 2 As shown, the five segments are A (a), B (b), C (c), D (d), and E (e). The slits extend from one edge of the plate-like structure of the DC compensation electrode to the opposite side to form segments, and the slits are blocked by laser-etched insulating tape when reaching the DC grounding end.

[0038] For example, the first segmented DC compensation electrode and the second segmented DC compensation electrode are both symmetrically divided into multiple segments, and a DC ground terminal is separated. Fixing holes are opened on the DC ground terminal and the radio frequency electrode to fix the electrodes on the insulating support structure.

[0039] In one of the embodiments, the angle between the RF electrode receiving the incident laser and the DC compensation electrode is an acute angle.

[0040] For example, Figure 3 As shown, when looking straight at the X-configuration ion trap, the X-axis is the left-right direction, and the Y-axis is the front-back direction. The Z-axis is the vertical direction, and the laser is incident on the ion trapping zone from the horizontal direction (XOY plane). The horizontal distance between the electrodes (along the X direction) is greater than the vertical distance (along the Z direction), which prevents the scattered light of the laser irradiating the blade from entering the fluorescence collection area 5. The angle of the fluorescence collection area is an obtuse angle, which ensures a high fluorescence collection efficiency.

[0041] In one embodiment, the gold-plated electrode is connected to the gold ribbon by pressure welding, and then the gold ribbon is connected to the copper wire by spot welding. The gold ribbon is a thin narrow ribbon made of gold. It can be understood as a section of conductive medium. The copper wire cannot be directly connected to the gold-plated electrode, and is connected through a short section of gold ribbon.

[0042] The device based on the present application can realize segmented fine adjustment of DC compensation electrodes, and is suitable for additional micro-motion fine adjustment and suppression of trapped multi-ions. It can be widely used in technical fields such as optical frequency standards, quantum precision measurement, and quantum computing.

[0043] Figure 4 A flow chart of a multiple ion trapping method according to an embodiment of the present application uses the blade trap device for multiple ion trapping described in any one of the embodiments of the first aspect, and includes steps 310 to 320.

[0044] Step 310: Apply a radio frequency signal and a radio frequency bias voltage to the radio frequency electrode. A radio frequency signal and a radio frequency bias voltage are applied to the first radio frequency electrode and the second radio frequency electrode for ion trapping.

[0045] Step 320: Apply different DC voltages to multiple segments of the DC compensation electrode.

[0046] Different DC voltages are applied to the five segments A to E of the first segmented DC compensation electrode, and different DC voltages are applied to the five segments a to e of the second segmented DC compensation electrode, so as to achieve radial and axial position adjustment of ions, trap multiple ions in the center of the potential well, and finely compensate for the additional micro-motion of multiple ions.

[0047] Generally, the voltages of A and a are the same, the voltages of B and b are the same, and the voltages applied to a pair of electrodes are the same, so that the ions are always on the Y axis. If the ions need to move radially, different voltages are applied to a pair of electrodes. According to the different micro-movements of multiple ions, different voltages are applied to each pair of electrodes in the experiment.

[0048] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0049] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0050] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A blade trap device for multiple ion trapping, characterized in that: Contains: radio frequency electrode, DC compensation electrode; The radio frequency electrode and the DC compensation electrode are in sheet shape, and the two radio frequency electrodes are opposite to each other, and the two DC compensation electrodes are opposite to each other, and are distributed in an X shape with the ion trapping zone as the axis; The DC compensation electrode is divided into at least two segments which are not interconnected along the radial direction of the axis from an edge close to the axis.

2. The blade trap device for multiple ion trapping according to claim 1, characterized in that: A DC grounding terminal is arranged on an edge of the DC compensation electrode away from the axis, and the segments are all connected to the grounding terminal, and the segments are insulated from the grounding terminal.

3. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The included angle between the radio frequency electrode receiving incident laser light and the DC compensation electrode is an acute angle.

4. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The DC compensation electrode is etched with four slits symmetrically along the radial direction of the axis to divide the motor into five sections that are not connected to each other.

5. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The DC compensation electrode and the radio frequency electrode are provided with through holes on a side away from the axis, which are used to fix the electrodes on the insulating bracket.

6. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The DC compensation electrodes are divided by slits; The width of the slit is in the order of tens of micrometers, and each segment is in the order of hundreds of micrometers.

7. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The electrode is fixed in the vacuum physics system, and the DC grounding terminal of the DC compensation electrode shares a common ground with the vacuum physics system.

8. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The gold-plated electrodes are connected to the gold ribbon by pressure welding, and then the gold ribbon is connected to the copper wire by spot welding.

9. The blade trap device for multiple ion trapping according to claim 1, characterized in that: The electrode material is alumina ceramic plated with gold.

10. A multi-ion trapping method, characterized in that: Using the blade trap device for multiple ion trapping according to any one of claims 1 to 9 comprises the following steps: Applying a radio frequency signal and a radio frequency bias voltage to the radio frequency electrode; Different DC voltages are applied to multiple segments of the DC compensation electrode.

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