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1. 发明公开

EP4428768A1 DEVICE AND METHOD FOR SIMULATING AN OPEN QUANTUM SYSTEM 审中-公开
公开(公告)号：EP4428768A1
公开(公告)日：2024-09-11
申请号：EP23305313.1
申请日：2023-03-08
申请人： Alice & Bob , Association pour la Recherche et le Développement des Méthodes et Processus Industriels (ARMINES)
发明人： ROUCHON, Pierre , LE REGENT, François-Marie
IPC分类号： G06N10/60 , G06N10/20
CPC分类号： G06N10/60 , G06N10/20
摘要： The invention relates to a device for simulating on a conventional computer an open quantum system including one or more quantum entities, each quantum entity being stabilized around a decoherence-free space. The corresponding simulation method is based on an original asymptotic development adapted to the so-called Heisenberg formulation of quantum mechanics and based on invariant operators of the local and nominal dynamics associated with each of the quantum entities. The nominal and local dynamics of a quantum entity refers to its own time evolution, without any external perturbation. The invariant operator of a quantum entity is a steady-state of the adjoint nominal dynamics according to the Frobenius product.

2. 发明公开

EP4372629A1 MEASUREMENT METHODS FOR A RESONANT CAT-QUBIT CIRCUIT 审中-公开
公开(公告)号：EP4372629A1
公开(公告)日：2024-05-22
申请号：EP22306685.3
申请日：2022-11-16
申请人： Alice & Bob
发明人： LESCANNE, Raphaël
IPC分类号： G06N10/40
CPC分类号： G06N10/40
摘要： The disclosure notably relates to a non-linear superconducting quantum circuit having a first mode and a second mode. Each of the first mode and the second mode has a respective resonant frequency. The circuit is configured such that the resonant frequency of the second mode is substantially 2N times the resonant frequency of the first mode when a predetermined current of a constant intensity is applied to the circuit. The circuit thereby performs intrinsically a resonant 2N-to-1 photon exchange between respectively the first mode and the second mode, N being a positive integer. This forms an improved non-linear superconducting quantum circuit. When this circuit receives a predetermined current and when the second mode is driven appropriately, the circuit can stabilize a cat-qubit. In order to perform quantum measurements on this circuit, a method is proposed which turns off the drive of the second mode to switch to a no-drive manifold in which the quantum measurements can be performed.

3. 发明公开

EP4428767A1 QUANTUM SYSTEM FOR PERFORMING A CNOT GATE AND QUANTUM SYSTEM FOR PERFORMING A REPETITION CODE USING THE SAME 审中-公开
公开(公告)号：EP4428767A1
公开(公告)日：2024-09-11
申请号：EP23305298.4
申请日：2023-03-06
申请人： Alice & Bob
发明人： COTTET, Nathanaël , JEZOUIN, Sébastien , LESCANNE, Raphaël , TOUZARD, Steven
IPC分类号： G06N10/40 , G06N10/70
CPC分类号： G06N10/40 , G06N10/70
摘要： A quantum system for performing a CNOT gate, comprising a command circuit for providing radiation, a target cat qubit device and a control qubit device, coupled linearly, the target cat qubit comprises a non-linear element that is ATS which serves two purposes : engineering the 2-photon conversion Hamiltonian for cat qubit stabilization and engineering the CNOT Hamiltonian for performing a CNOT gate with the control qubit device. At any point in time, the ATS serves either the role of cat qubit stabilization or the role of CNOT gate.

4. 发明公开

EP4383140A1 MINIMAL SUPERCONDUCTING QUANTUM CIRCUIT FOR BOSONIC CODES WITH GALVANIC COUPLING 审中-公开
公开(公告)号：EP4383140A1
公开(公告)日：2024-06-12
申请号：EP22306816.4
申请日：2022-12-07
申请人： Alice & Bob
发明人： ESSIG, Antoine , LESCANNE, Raphaël , JEZOUIN, Sébastien
IPC分类号： G06N10/40 , G06N10/70 , B82Y10/00
CPC分类号： G06N10/40 , B82Y10/00 , G06N10/70
摘要： A Non-linear superconducting quantum circuit comprising at least one resonant portion (30,32) and an asymmetrical threaded superconducting quantum interference device (34) connected galvanically, said non-linear superconducting quantum circuit having a first mode with a first resonant frequency and a second mode with a second resonant frequency, the ratio between said first resonant frequency and said second resonant frequency being different from ½, said at least one resonant portion (30,32) having a symbolic representation comprising a linear resonant portion (32) comprising at least one inductance (320) and at least one capacitor (322) and a non-linear resonant portion (30) comprising at least one capacitor (302) and said asymmetrical threaded superconducting quantum interference device (34), said linear resonant portion (30) and non-linear resonant portion (32) being connected galvanically and arranged respectively such that one has its elements connected in series, and the other one has its elements connected in parallel, said at least one resonant portion (30,32) being configured with inductance and capacitance values which induce with said asymmetrical threaded superconducting quantum interference device (34) said first mode (a) and said second mode (b) such that, said non-linear superconducting quantum circuit (100) has zero-point fluctuations of the superconducting phase across the asymmetrical threaded superconducting quantum interference device (34) for the first mode and the second mode which are superior or equal to 0.05 rad.

5. 发明公开

EP4170559A1 DISPOSITIF DE QUBIT SUPRACONDUCTEUR A ISOLATION ELECTROMAGNETIQUE 有权转让
公开(公告)号：EP4170559A1
公开(公告)日：2023-04-26
申请号：EP22202821.9
申请日：2022-10-20
申请人： Alice & Bob
发明人： JEZOUIN, Sébastien
IPC分类号： G06N10/40
摘要： Un dispositif de qubit supraconducteur à isolation électromagnétique comprenant un conducteur électrique (4) présentant une face (8) sensiblement plane et un conducteur magnétique artificiel (6) présentant une face (14) sensiblement plane en regard de la face (8) dudit conducteur électrique (4), et un ou plusieurs qubits (20) réalisés sur ou dans l'un dudit conducteur électrique (4) et dudit conducteur magnétique artificiel (6), les dimensions des éléments constituant le conducteur magnétique artificiel (6) et la distance séparant la face (8) dudit conducteur électrique (4) et la face (14) dudit conducteur magnétique artificiel (6) étant choisies de manière à réaliser une structure à bande électromagnétique interdite qui comprend les fréquences desdits qubits (20).

6. 发明公开

EP4428765A1 SYSTEM FOR PERFORMING A QUANTUM GATE AND OPERATION OF A QUANTUM ERROR CORRECTING CODE USING THIS QUANTUM GATE 审中-公开
公开(公告)号：EP4428765A1
公开(公告)日：2024-09-11
申请号：EP23305297.6
申请日：2023-03-06
申请人： Alice & Bob , INRIA - Institut National de Recherche en Informatique et en Automatique
发明人： GUILLAUD, Jérémie , LESCANNE, Raphaël , SARLETTE, Alain , GAUTIER, Ronan
IPC分类号： G06N10/20 , G06N10/70
CPC分类号： G06N10/70 , G06N10/20
摘要： A quantum system for performing a quantum gate comprises a command circuit (8) for selectively applying radiation, a number N of data resonators (4), with N equal to or greater than two, each data resonator (4) having a respective resonance frequency and being coupled to said command circuit (8) for stabilizing a respective data cat qubit, and an ancilla resonator (6) having an ancilla resonance frequency coupled to said command circuit (8) for stabilizing an ancilla cat qubit and being non-linearly coupled via said command circuit (8) to said data resonators (4). The command circuit (8) is arranged to perform a quantum gate by:
a) while stabilizing said ancilla cat qubit, applying a radiation having said ancilla resonance frequency such that said data resonators (4) and said ancilla resonator (6) are substantially simultaneously subject to a Hamiltonian resulting from said radiation having said ancilla resonance frequency,
b) turning off said radiation having said ancilla resonance frequency after a chosen duration. This principle is extended to perform a a quantum correction error code.

7. 发明公开

EP4383139A1 SUPERCONDUCTING QUANTUM CIRCUIT FOR BOSONIC CODES WITH GALVANIC COUPLING 审中-公开
公开(公告)号：EP4383139A1
公开(公告)日：2024-06-12
申请号：EP22306815.6
申请日：2022-12-07
申请人： Alice & Bob
发明人： ESSIG, Antoine , LESCANNE, Raphaël , JEZOUIN, Sébastien
IPC分类号： G06N10/40 , G06N10/70
CPC分类号： G06N10/40 , G06N10/70
摘要： A non-linear superconducting quantum circuit comprising at least one resonant portion (30,32) and an asymmetrical threaded superconducting quantum interference device (34) connected to said at least one resonant portion (30,32) galvanically, said non-linear superconducting circuit having a first mode with a first resonant frequency and a second mode with a second resonant frequency, the ratio between said first resonant frequency and said second resonant frequency being different from ½, said at least one resonant portion (30,32) being configured with inductance and capacitance values of its symbolic representation which induce with said asymmetrical threaded superconducting quantum interference device (34) said first mode and said second mode such that, said non-linear superconducting quantum circuit has zero-point fluctuations of the superconducting phase across the asymmetrical threaded superconducting quantum interference device (34) for the first mode and the second mode which are superior or equal to 0.05 rad.

8. 发明公开

EP4372628A1 DEVICE FOR A RESONANT CAT-QUBIT CIRCUIT AND QUANTUM MEASUREMENT METHOD 审中-公开
公开(公告)号：EP4372628A1
公开(公告)日：2024-05-22
申请号：EP22306684.6
申请日：2022-11-16
申请人： Alice & Bob
发明人： ESSIG, Antoine , COTTET, Nathanaël , LESCANNE, Raphaël
IPC分类号： G06N10/40
CPC分类号： G06N10/40
摘要： The disclosure notably relates to a non-linear superconducting quantum circuit having a first mode and a second mode. Each of the first mode and the second mode has a respective resonant frequency. The circuit is configured such that the resonant frequency of the second mode is substantially 2N times the resonant frequency of the first mode when a predetermined current of a constant intensity is applied to the circuit. The circuit thereby performs intrinsically a resonant 2N-to-1 photon exchange between respectively the first mode and the second mode, N being a positive integer. This forms an improved non-linear superconducting quantum circuit. When this circuit receives a predetermined current and when the second mode is driven appropriately, the circuit can stabilize a cat-qubit. In a symmetrical version of this circuit, in order to perform quantum measurements, a flux line has been developed to allow RF coupling substantially exclusively to the second mode and not to the first mode. This allows to turn off the stabilization and perform quantum measurements.

9. 发明公开

EP4207005A1 NON-LINEAR SUPERCONDUCTING QUANTUM CIRCUIT 审中-实审转让
公开(公告)号：EP4207005A1
公开(公告)日：2023-07-05
申请号：EP21306965.1
申请日：2021-12-31
申请人： Alice & Bob
发明人： Lescanne, Raphaël
IPC分类号： G06N10/40 , G06N10/70 , G06N10/20
摘要： The disclosure notably relates to a non-linear superconducting quantum circuit having a first mode and a second mode. Each of the first mode and the second mode has a respective resonant frequency. The circuit is configured such that the resonant frequency of the second mode is substantially 2N times the resonant frequency of the first mode when a predetermined current of a constant intensity is applied to the circuit. The circuit thereby performs intrinsically a resonant 2N-to-1 photon exchange between respectively the first mode and the second mode, N being a positive integer. This forms an improved non-linear superconducting quantum circuit.

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