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# Java > Open Source Codes > JSci > physics > quantum > SpinOperator

 `1 package JSci.physics.quantum;2 3 import JSci.maths.*;4 import JSci.maths.matrices.AbstractComplexSquareMatrix;5 import JSci.maths.algebras.*;6 7 /**8 * The SpinOperator class provides an object for encapsulating spin operators.9 * @version 2.010 * @author Mark Hale11 */12 public final class SpinOperator extends Operator {13         private static final LieAlgebra spin1_2=su2Dim2.getInstance();14         private static final LieAlgebra spin1=su2Dim3.getInstance();15         /**16         * Spin 1/2 operator (x).17         */18         public static final SpinOperator X1_2=new SpinOperator(spin1_2.basis()[0]);19         /**20         * Spin 1/2 operator (y).21         */22         public static final SpinOperator Y1_2=new SpinOperator(spin1_2.basis()[1]);23         /**24         * Spin 1/2 operator (z).25         */26         public static final SpinOperator Z1_2=new SpinOperator(spin1_2.basis()[2]);27         /**28         * Spin 1 operator (x).29         */30         public static final SpinOperator X1=new SpinOperator(spin1.basis()[0]);31         /**32         * Spin 1 operator (y).33         */34         public static final SpinOperator Y1=new SpinOperator(spin1.basis()[1]);35         /**36         * Spin 1 operator (z).37         */38         public static final SpinOperator Z1=new SpinOperator(spin1.basis()[2]);39         /**40         * Constructs a spin operator.41         */42         private SpinOperator(AbstractComplexSquareMatrix spinMatrix) {43                 super(spinMatrix);44         }45         /**46         * Returns true if this operator is self-adjoint.47         */48         public boolean isSelfAdjoint() {49                 return true;50         }51         /**52         * Returns true if this operator is unitary.53         */54         public boolean isUnitary() {55                 return true;56         }57         /**58         * Returns the trace.59         */60         public Complex trace() {61                 return Complex.ZERO;62         }63 }64 65 ` Popular Tags