Search

EP-4740224-A1 - SYSTEMS AND METHODS FOR INTERACTING WITH A MATTER PARTICLE

EP4740224A1EP 4740224 A1EP4740224 A1EP 4740224A1EP-4740224-A1

Abstract

A system for forming electromagnetic, EM, radiation for interacting with a plurality of matter particles in an interaction region. The matter particles acting as qubits in a quantum computation. The system comprising: a source assembly for generating EM radiation comprising a plurality of EM emitters, the system configured to form an EM intensity distribution of the EM radiation in the interaction region for each of the EM emitters; the plurality of EM emitters comprises: i) a first set of two or more of the plurality of EM emitters associated with a first matter particle of the plurality of matter particles; and ii) further EM emitters associated with one or more different matter particles to the first matter particle. The system is further configured such that the EM radiation from each of the EM emitters of the first set forms an intensity distribution covering a different portion of the interaction region to the EM distributions of: a) the other EM emitters within the first set; and b) the further EM emitters.

Inventors

  • DREON, Davide
  • FAVIER, PIERRE
  • NGUYEN, CATHERINE

Assignees

  • Pasqal

Dates

Publication Date
20260513
Application Date
20240708

Claims (15)

  1. 1. A system for forming electromagnetic, EM, radiation for interacting with a plurality of matter particles in an interaction region, wherein the matter particles are neutral atoms, the matter particles acting as qubits in a quantum computation; the system comprising: a source assembly for generating EM radiation comprising a plurality of EM emitters, wherein the EM radiation comprises a wavelength in the visible or near infrared spectrum, the system configured to form an EM intensity distribution of the EM radiation in the interaction region for each of the EM emitters; the plurality of EM emitters comprises: i) a first set of two or more of the plurality of EM emitters associated with a first matter particle of the plurality of matter particles; and ii) further EM emitters associated with one or more different matter particles to the first matter particle; wherein the system is further configured such that the EM radiation from each of the EM emitters of the first set forms an intensity distribution covering a different portion of the interaction region to the EM distributions of: a) the other EM emitters within the first set; and b) the further EM emitters.
  2. 2. The system of claim 1, wherein the EM radiation from each of the EM emitters is output from the source assembly by the EM emitters, and the EM radiation is received at the EM emitters from further components of the source assembly.
  3. 3. The system of claim 1 or 2, wherein the interaction region comprises a plurality of subregions; the first set of EM emitters is associated with a first subregion of the plurality of subregions, the further EM emitters are associated with one or more further subregions of the plurality of subregions, and each of the subregions covers a different spatial extent of the interaction region to the other subregions.
  4. 4. The system of any preceding claim, wherein the plurality of EM emitters comprises a second set of two or more of the plurality of EM emitters associated with a second matter particle of the plurality of matter particles.
  5. 5. The system of claim 4, wherein each of the EM emitters of the second set forms an intensity distribution covering a different portion of the interaction region to the EM distributions of: a) the other EM emitters within the second set; b) the EM emitters within the first set; and c) the further EM emitters.
  6. 6. The system of any of claims 3 to 5, wherein the plurality of subregions are non-overlapping.
  7. 7. The system of any preceding claim, wherein the system is configured to form an irregular pattern of EM distributions in the interaction region.
  8. 8. The system of any of claims 3 to 7, wherein the system is configured such that each of the EM distributions is associated with a position in the interaction region, the system further configured such that the positions of the EM distributions associated with the first set of emitters are arranged in a regular pattern within the first subregion.
  9. 9. The system of any of claims 3 to 8, wherein the first subregion is associated with the first matter particle, and the one or more further subregions are associated with one or more different matter particles to the first matter particle.
  10. 10. The system of any preceding claim, wherein the system is configured to receive a plurality of input electrical signals, the signals determining the outputting of radiation from each of the EM emitters, a first set of the plurality of electrical signals configured to determine the output of radiation from a first emitter of the first set of EM emitters, and a second set of the plurality of electrical signals configured to determine the output of radiation from a second emitter of the first set of EM emitters.
  11. 11. The system of any preceding claim, wherein the plurality of EM emitters are arranged on a plane.
  12. 12. The system of claim 11, wherein at least one of the plurality of EM emitters outputs the EM radiation out-of-plane of the plane of the array of EM emitters.
  13. 13. The system of any preceding claim, wherein at least two of the plurality of EM emitters are located upon a common device.
  14. 14. A method of forming electromagnetic, EM, radiation for interacting with a plurality of matter particles in an interaction region, wherein the matter particles are neutral atoms, the matter particles acting as qubits in a quantum computation; the method comprising: generating EM radiation from a source assembly comprising a plurality of EM emitters, wherein the EM radiation comprises a wavelength in the visible or near infrared spectrum; forming an EM intensity distribution of the EM radiation in the interaction region for each of the plurality of EM emitters, wherein i) a first set of two or more of the plurality of EM emitters are associated with a first matter particle of the plurality of matter particles; and ii) further EM emitters are associated with one or more different matter particles to the first matter particle; wherein the EM radiation from each of the EM emitters of the first set forms an intensity distribution covering a different portion of the interaction region to the EM distributions of: a) the other EM emitters within the first set; and b) the further EM emitters.
  15. 15. A system as claimed in any of claim 1-13 and/or a method as claimed in claim 14 wherein the quantum computation is a neutral atom quantum computation.

Description

Systems and methods for interacting with a matter particle Technical Field The present invention is in the field of electromagnetic signals, in particular, but not limited to traps for holding matter particles for quantum computation. Background Matter particles such as ions or neutral atoms may be used in various systems including quantum computation. Such systems typically require matter particles to be held in a particular position whilst an operation is performed on them with an external stimulus such as laser light. One such system is a neutral atom quantum computer wherein different patterns of traps are required to be consecutively set-up. In these systems, atoms are trapped in arrays of optical traps, known as optical tweezers, which are tightly focused laser beams produced by sending a beam into a beam-shaping device and high-numerical aperture optics. A spatial light modulator (SLM) can be used as a suitable beamshaping device, enabling arranging the tweezers in programmable arbitrary geometric patterns in ID, 2D or 3D shapes. Liquid Crystal SLMs are known to be used as beam shaping devices to separate a single laser beam into multiple traps. Another approach is using Acousto-Optic Deflectors (AOD) to generate multiple beams. These current solutions have slow refresh rates of the device when different geometrical patterns need to be used in succession. In addition, current prior art solutions do not provide individual addressability of the sites in a given pattern. The existing alternative solutions have limitations. AODs have the problem of not being adapted to arbitrary geometrical patterns (if not done by time multiplexing) and the addressability also must be done either by entire columns or by lines since the deflections are applied subsequently. Digital micromirrors devices (DMD) have a higher refresh rate but not sufficient for many applications, and they are limited in optical power efficiency. Grimm et al., "Optical Dipole Traps for Neutral Atoms", 42, 2000, 95-170 discusses methods for trapping atoms and experimental techniques for optical traps. Nogrette et al., "Single-Atom Trapping in Holographic 2D Arrays of Microtraps with Arbitrary Geometries", Phys. Rev. X 4, 021034 discusses arrays generated using a spatial light modulator and an optical dipole-trap beam for trapping single rubidium atoms. The trapping methods disclosed in these documents do not provide individual addressability of the trapping sites. WO2021/112948 describes optical holographic addressing of atomic quantum bits. In the background section of this document there is described arrays of vertical -cavity surface-emitting lasers (VCSELs) for visible light, along with the limitations of using VCSELs for such a system. In paragraph 0060, WO2021/112948 briefly describes, with respect to figure 7 of the same document, using an array of coherent light sources, such as VCSELs, where each laser is actuated to produce a corresponding spatial-mode distribution. WO2021/112948 does not provide an enabling disclosure for how to use VCSELs in such a system. Summary This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. In a first aspect there is presented a system (2) for use in a quantum computation; the system (2) comprising: I) a chamber (4) for accommodating a plurality of spatially separated matter particles (6) for use as qubits in the quantum computation; II) a source assembly (8) comprising a plurality of surface-emitting electromagnetic, EM, sources (10) configured to output EM radiation (12); the system (2) configured to form a plurality of regions (14) of the EM radiation in the chamber (4), wherein at least two (16) of the plurality of regions (14) are for interacting with at least one of the spatially separated matter particles (6). In other words, at least a first and second region (16) of the plurality of regions (14) are each for interacting with at least one of the spatially separated matter particles (6). For example, both regions may interact with the same one (or more) matter particles, or each region may interact with one (or more) different matter particles. The system of the first aspect may be adapted according to any suitable way disclosed herein, including but not limited to any one or more of the following options. It is to be understood that any of the following options may be combined with any of the examples described elsewhere herein. The system may be configured such that: a first region of the plurality of regions is for trapping a first matter particle; a second region of the plurality of regions is for trapping a second matter particle; the first region being spatially separate to the second region. The system may be configu