Two‐Qubit State Swap and Entanglement Creation in a Superconducting Circuit QED via Counterdiabatic Drivings

Abstract

Optimal coherent control of many qubits is critical to quantum information processing. Here, an efficient scheme is proposed for implementing state swap and creating an entanglement with two superconducting qubits in a circuit quantum electrodynamics (QED). Two qutrits of Cooper‐pair box (CPB) circuits are placed into a cavity field and are driven by individual classical microwaves. In the two‐photon resonance with a large detuning, each CPB is reduced into a qubit effectively. Within a composite system composed of qubit states and cavity photons, two‐qubit state swap and entanglement can be fast obtained using the technique of shortcuts to adiabaticity with counterdiabatic drivings. Benefited from the shorter duration times and less sensitivity to timing errors and parameter imperfections, high‐fidelity quantum operations can be performed with the accessible decoherence rates. The present protocol could offer a feasible route towards optimized operations on superconducting qubits in a circuit QED.

Precise Nondestructive Parity Measurement of Artificial Atoms Using a Superconducting Resonator and Homodyne Measurement

“…Apart from its significant application in QEC, parity measurement also plays an important role in the field of quantum information processing (QIP), [13][14][15][16][17][18][19][20][21][22][23][24] such as quantum computation, [25][26][27][28][29][30][31] generating entangled states, [32][33][34][35][36][37][38][39][40] purifying entangled states, [41][42][43][44][45][46] and quantum teleportation. [47][48][49] Traditional parity measurement destroys the original state in the system while obtaining parity information, which leads to the waste of quantum entanglement resources.…”

Flux-controllable and fast state inversion in a Laudau–Zener system of superconducting charge qubit

“…Recently, a set of techniques called shortcuts to adiabaticity (STA) has been developed [19,20]. By the method of STA, the adiabatic-like operation can be constructed but in a much shorter time, which thus provides an attractive avenue towards rapid and robust information processing [21][22][23][24][25][26][27][28][29][30]. However, the shortcut of invariant-based inverse engineering generally needs the driving pulses with complex time profiles, which could pose a possible severe challenge in experiment.…”

Speeding up generation of photon Fock state in a superconducting circuit via counterdiabatic driving*

“…[10,11] By taking advantage of circuit QED, the explorations of quantum information science and fundamental laws have attracted increasing attention in recent years. [12][13][14][15][16][17][18] In the context of quantum information processing, generating microwave photon Fock states in circuit QED is an interesting research subject. [19][20][21][22][23][24][25] Experimentally, by the method of stimulated Raman adiabatic passage (STIRAP), the generation of microwave photon Fock states has been demonstrated using the setup of superconducting circuit QED.…”